Changing perceptions of hunger on a high nutrient density diet
© Fuhrman et al; licensee BioMed Central Ltd. 2010
Received: 27 May 2010
Accepted: 7 November 2010
Published: 7 November 2010
People overeat because their hunger directs them to consume more calories than they require. The purpose of this study was to analyze the changes in experience and perception of hunger before and after participants shifted from their previous usual diet to a high nutrient density diet.
This was a descriptive study conducted with 768 participants primarily living in the United States who had changed their dietary habits from a low micronutrient to a high micronutrient diet. Participants completed a survey rating various dimensions of hunger (physical symptoms, emotional symptoms, and location) when on their previous usual diet versus the high micronutrient density diet. Statistical analysis was conducted using non-parametric tests.
Highly significant differences were found between the two diets in relation to all physical and emotional symptoms as well as the location of hunger. Hunger was not an unpleasant experience while on the high nutrient density diet, was well tolerated and occurred with less frequency even when meals were skipped. Nearly 80% of respondents reported that their experience of hunger had changed since starting the high nutrient density diet, with 51% reporting a dramatic or complete change in their experience of hunger.
A high micronutrient density diet mitigates the unpleasant aspects of the experience of hunger even though it is lower in calories. Hunger is one of the major impediments to successful weight loss. Our findings suggest that it is not simply the caloric content, but more importantly, the micronutrient density of a diet that influences the experience of hunger. It appears that a high nutrient density diet, after an initial phase of adjustment during which a person experiences "toxic hunger" due to withdrawal from pro-inflammatory foods, can result in a sustainable eating pattern that leads to weight loss and improved health. A high nutrient density diet provides benefits for long-term health as well as weight loss. Because our findings have important implications in the global effort to control rates of obesity and related chronic diseases, further studies are needed to confirm these preliminary results.
One of the common barriers to weight loss is the uncomfortable sensation of hunger that drives overeating and makes dieting fail, even in those who are obese from over-consumption of calories. Over the past two decades we have worked closely with approximately twenty thousand patients in a private suburban family practice in New Jersey specializing in nutritional interventions for weight loss and disease prevention/management. Our experience is that enhancing the micronutrient quality of the diet even in the context of a substantially lower caloric intake dramatically mitigates the experience of hunger. A diet high in micronutrients appears to decrease food cravings and overeating behaviors. Sensations such as fatigue, weakness, stomach cramps, tremors, irritability and headaches, commonly interpreted as "hunger", resolve gradually for the majority of people who adopt a high nutrient density diet, and a new, less distressing, sensation (which we label "true" or "throat" hunger) replaces it.
It is well documented that a diet low in antioxidant and phytochemical micronutrients leads to heightened oxidative stress and a build-up of toxic metabolites [1–4]. It has also been shown that a higher intake of nutrient rich plant foods decreases measurable inflammatory by-products [5–10]. Our hypothesis is that a diet containing an abundance of processed food and low in micronutrient-rich plant foods can create physical symptoms of withdrawal when digestion ceases in between meals. Our contention is that during the catabolic phase of the digestion and refeeding cycle, when digestive activities cease, these withdrawal symptoms, misperceived as "hunger", develop from a diet that is inadequate or poor in micronutrients. We call these symptoms "toxic hunger". It is our clinical experience that such withdrawal symptoms drive overeating behavior and are a major factor leading to obesity. There is significant support for our observation and hypothesis, yet a relative lack of research on the determinants of overeating behavior and the hunger drive. A "dopaminic high" [11, 12] from ingestion of high calorically concentrated sweets and fats has been documented and leads to subsequent craving of these foods. Very little human research has been done in this area.
In this investigation we were interested specifically in exploring the effect of a high nutrient density diet on participants' perceptions of hunger. We speculate that the discomfort of withdrawal from the toxins mobilized when one tries to refrain from consumption of pro-inflammatory processed foods and animal products may be also be a major contributor to compulsive eating and consequent obesity. Dietary micronutrients such as antioxidants and phytonutrients are required for the body to properly reduce the production and removal of metabolic waste products. In counseling patients to increase their micronutrient intake from greens and other nutrient-rich plant foods, our experience is that healthful eating is more effective for long-term weight control because it modifies and diminishes the sensations of withdrawal-related hunger, enabling overweight individuals to be more comfortable even while consuming substantially fewer calories.
In an attempt to further explore and validate our clinical observations, we conducted an internet-based survey of 768 individuals who had changed from the previous usual diet to a high nutrient density diet. The participants were recruited from a physician-run website of approximately 4000 subscribers designed to support the shift to a high nutrient density diet. In the survey we investigated the relationship between dietary micronutrient density and the symptoms of hunger.
Subjects and Methods
Population and Sample
We recruited by e-mail a convenience sample of 768 participants from a population of over 4000 subscribers to a website that provides education and support for people who wish to improve their eating habits to a high nutrient density diet. The website is hosted by a family physician specializing in nutrition. In addition to the website, most of the subscribers also have at least one of several books written by the physician on a healthy diet-style to maximize nutrition and weight reduction. The subscribers come from all parts of the United States and Canada, as well as a small number from Europe. About 65% of the subscribers to the website are female, with ages ranging from 35 to 65. Average household income of this population breaks down as follows: 27% $100-250K; 14% $85-100K; 10% $65-75K; and 8% $75-85K. Educational level of subscribers is: High School 16%; Vocational Technology credential 5%; Associate degree 11%; Bachelors 34%; Master 25%; Doctorate 9%. 71% are married, 17% single, 10% divorced and 1% are widowed. Information provided on the website includes the disease-protective and weight loss benefits of a diet rich in micronutrients from colorful vegetables, beans, seeds, nuts, fruits and whole grains and low (less than 10% of total calories) in processed foods and animal products.
Eligible participants were subscribers who indicated that they had made a change from their previous usual diet to a high nutrient density diet for at least one month. Consent was implied by clicking on a link to start the survey. The surveys were anonymous and were submitted via the Survey Monkey website. Settings available on the Survey Monkey website were activated to block repeated submissions by participants.
A review of some of the commonly used instruments to assess hunger and eating behaviors such as the Three-Factor Eating Questionnaire and its earlier Eating Inventory [14, 15] led us to conclude that these instruments do not assess in detail the actual symptoms of hunger. One tool developed by Friedman [14, 16] does assess both the location and sensations of hunger. We did not find it to capture the specific issues that we were interested in examining and it would have been difficult to administer it online, so we developed our own internet-based pilot survey. The survey questions were divided into three conceptual categories: physical symptoms of hunger, emotional symptoms of hunger, and location of hunger. The items were revised per recommendation of other research team members through a step-wise process, to establish a preliminary content validity. The survey was then pilot tested with a group of twenty patients for ease of completion and clarity. After administration, internal consistency of the questions on the previous usual diet and the high nutrient density diet were analyzed using Cronbach's alpha. The alpha coefficient for the eight previous usual diet questions was .868 and for the eight high nutrient density diet questions was .851, suggesting that the items have relatively high internal consistency. Question 10 was omitted from the Cronbach analysis because it did not ask specifically about each kind of diet.
The survey questions referred to two types of diet: the participant's previous usual diet and the high nutrient density diet. Based on our clinical experience, we assumed that participants' previous usual diet received a majority of calories from processed, commercially prepared foods with added salt and sugars, oils, white flour as well as dairy and meats. Conversely, the high nutrient density diet is mostly unrefined, unprocessed plant food with minimal or no added salt, sugars, oils, and a minimal amount of animal products or no animal products. Access to the survey began with an informed consent question and the participant could only proceed by answering "yes". The remaining 13 questions were divided into 3 sections:
Section I: Dietary Questions (Questions 2-5)
These were four multiple choice questions about past and present diet style and eating habits including the degree and length of adherence to the high nutrient density diet. Two items served to measure the explanatory (independent) variables. Question 4 assessed length of adherence: "Approximately how long have you maintained the level of dietary change you indicated in the previous question?" The options were: less than 6 months, 6 to 12 months, more than 1 year, more than 5 years. Question 5 assessed degree of adherence: "Generally speaking, you adhere to a high nutrient density diet style". The options were: not very often, somewhat often, most of the time, all of the time.
Section II: Physical Sensations of Hunger (Questions 6 through 9)
This group of five Likert-scale questions asked about the participant's subjective symptoms and feelings of hunger including quality, and timing of symptoms.
Section III: Psychological, Mental and Emotional Aspects of Hunger (Questions 10 through 13)
The four Likert-scale questions in the final section pertained to how hunger affects the participant's emotions, thoughts and feelings.
Section IV: Location of Hunger
Question 14 presented a graphic of a human torso and asked participants to specify where on the graph they feel hunger.
The procedures we followed were in accordance with the ethical standards of and approval was obtained from the Institutional Review Board of the University of San Diego.
Conduct the Wilcoxon test to compare the experience of hunger on the high nutrient density diet versus the previous usual diet.
Conduct the Spearman rho test to see if the experience of the discomforts of hunger with the high nutrient density diet was inversely correlated with the length of time on and adherence to the high nutrient density diet.
Perform the McNemar test to examine the relation between the type of diet and the location of hunger. Each possible location as indicated on a diagram was considered a dichotomous variable with choices "select" or "not select". The McNemar test provides the ability to conduct nonparametric testing comparing two groups when at least one variable is dichotomous .
Descriptive statistics for the explanatory variables degree and length of adherence
Question 2 asked participants how familiar they are with the high nutrient density diet. Nearly 80% of participants indicated that they were "very familiar" with the diet. Question 3 asked participants to quantify their level of change to the high nutrient density diet. 76.5% of participants indicated that they adhere to the high nutrient density diet 75% to 100% of the time. Question 4 asked participants how long they had maintained their change to the high nutrient density diet. 23% had been on the high nutrient density diet less than 6 months, 16.9% between 6 and 12 months, 38.3% more than one year, and 12.1% more than 5 years. Question 5 asked participants to assess how often they observe the high nutrient density diet. 1.6% indicated not very often, 10.4% indicated somewhat often, 54,8% indicated most of the time, and 24.3% indicated all of the time.
As indicated above, questions 4 and 5 were used to measure the explanatory variables length and degree of adherence, against which responses to the questions related to the experience of hunger on the high nutrient density diet were compared.
Physical experience of hunger on high nutrient density diet vs. previous usual diet
Emotional experience of hunger on high nutrient density diet vs. previous usual diet
Location of hunger on high nutrient density diet vs. previous usual diet
Correlations between length on and adherence to high nutrient density diet and experience of hunger
Spearman's rho correlations between physical experience of hunger and length of time on and degree of adherence to the high nutrient density diet.
6B. Frequency of hunger pains on high nutrient density diet
Correlation coefficient r
7B. Discomfort between meals on high nutrient density diet
Correlation coefficient r
8B. Discomfort if meal is skipped on high nutrient density diet
Correlation coefficient r
9B. Frequency of hunger on high nutrient density diet
Correlation coefficient r
10. How much hunger has changed on high nutrient density diet
Correlation coefficient r
Spearman's rho correlations between emotional experience of hunger and length of time on and degree of adherence to the high nutrient density diet.
11B. Mood affected by hunger on high nutrient density diet
Correlation coefficient r
12B. Irritable when hungry on high nutrient density diet
Correlation coefficient r
13B. Hunger is less unpleasant on high nutrient density diet
Correlation coefficient r
This study provides important insights into hunger in a society characterized by over-consumption of processed food with an excess of calories and deficiency of micronutrients. Such hunger creates a cycle of overeating leading to obesity and is an obstacle for those who attempt to establish a healthy eating pattern and normal BMI. We found highly significant differences in the experience of hunger on the high nutrient density diet compared to the previous usual diet in a large sample of people who had made the shift to a diet high in micronutrients and lower in calories. The uncomfortable physical and emotional symptoms of hunger were much less prevalent after a change to the high nutrient density diet was made. We also observed a "dose response" that was strongly correlated with the degree of adherence to the high nutrient density diet. Our findings reveal that those who are able to make the change to a high nutrient density diet experience uncomfortable sensations of hunger less often than they experienced on their previous usual diet. In this survey of 768 participants, over 75% indicated that they observe the high nutrient density diet most or all of the time. Participants who adhered to the high nutrient density diet overall found hunger to be an uncomfortable experience less often; this may explain the previously reported high levels of compliance and successful weight loss  with the high nutrient density diet. Their hunger was less often characterized by classic withdrawal symptoms such as headaches, tremors, stomach cramps, and mood changes. Rather, it was more often felt as a throat sensation that was easily tolerated.
Recent research on the physiology of metabolism provides a plausible explanation for our findings. When a diet is low in dietary antioxidants, phytochemicals and other micronutrients, intra-cellular waste products such as free radicals, advanced glycation end products, lipofuscin, lipid A2E, and others accumulate [9, 19]. Other studies have demonstrated an adverse impact of low-micronutrient foods containing higher amounts of simple carbohydrates, fats and animal products on levels of inflammatory markers, metabolic by-products and oxidative stress in the body [20, 21]. It is well established in the scientific literature that these substances contribute to disease [22–25], and can be associated with typical withdrawal symptoms, including headaches [26, 27]. Heightened elimination of these waste products may create symptoms that can be experienced similarly to withdrawal from drug addiction . In the absence of an adequate intake of phytochemicals and other micronutrients, cellular detoxification is impaired  which elevates cellular free radical activity, priming the body with more substrate to induce withdrawal symptoms when digestion ceases. Our theory is that these uncomfortable symptoms, relieved by eating which halts catabolism and arrests the detoxification process, are widely misperceived as hunger. In a society with an abundance of fast food and high rates of obesity, commonly experienced sensations of hunger may actually be symptoms of withdrawal from a diet that is inadequate in micronutrients. Such a diet creates an excess of pro-inflammatory metabolic waste products as well as an addiction syndrome. There is growing evidence that food addiction is a clinical pathological condition [30–43]. Our hypothesis, supported by this pilot study, is that this addiction is caused by withdrawal symptoms misread as hunger from pro-inflammatory foods and can be mitigated by consumption of a diet high in anti-inflammatory micronutrients found in vegetables and other micronutrient-rich plant foods.
Evidence suggests that overweight individuals build up more inflammatory markers and oxidative stress when fed a low nutrient meal compared to normal weight individuals [20, 21]. The heightened inflammatory potential in those with a tendency for obesity is marked by increasing levels of lipid peroxidase and malondialdehyde and reduced activation of hepatic detoxification enzymes . This is supportive of our experience that people prone to obesity get more withdrawal/hunger symptoms, preventing them from being comfortable in the non-digestive (catabolic) stage where breakdown and mobilization of toxins is enhanced. The resulting uncomfortable symptoms drive them to eat again and over-consume calories. It is a vicious cycle promoting continuous (anabolic) digestion, frequent feedings and increased intake of calories. Chronically overweight people in the typical American food environment feel "normal" only by eating too frequently or by eating a heavy meal, so that the anabolic process of digestion and assimilation continues right up to the beginning of the next meal. In both cases, as our overweight patients report, excess calories are needed in order to feel normal. A review of research on companion animals suggested that the introduction of specific micronutrients positively influenced the health status of animals whose natural detoxification systems were compromised, and reduced the accumulation of inflammatory markers . This may explain why those on the high nutrient density diet were able to go for longer periods without feeling "hunger" symptoms.
There exists only a small body of previous research exploring the relationship between the type of foods ingested and the intensity and/or frequency of hunger. One theory that has been investigated is the glucostatic theory which links dynamic changes in blood glucose with appetitive sensations [45–48]. Several studies have explored the relation between the glycemic index or fiber content of food and satiety, whereas others have examined whether the type or amount of fatty acids, sugars or protein in the diet affect the sense of hunger [49–62]. Results have been inconsistent. This may be due to the unknown variable of micronutrient intake in these studies. Some studies have documented a decrease in appetite with ingestion of greater amounts of fiber and/or micronutrients [49, 52, 56]. Recently, a Canadian study found that fasting and postprandial appetite ratings were reduced in women who were supplemented with multivitamins and minerals .
The findings of this study are particularly significant given the nature of the diet we studied. Highly significant reductions in blood pressure, LDL cholesterol, fasting glucose and body weight have been reported in persons who have made the change to a high micronutrient diet . Further, there is a vast body of research documenting the protective benefit of a micronutrient-rich diet against cancer and cardiovascular disease [1, 8, 10, 24, 25, 64–77]. If clinicians can assure their patients with confidence that they will not experience uncomfortable sensations of hunger after the "detoxification" stage is over, they can keep their patients motivated to withstand the withdrawal symptoms they experience early in the dietary transition. The outcome will be not only substantial and sustainable weight loss, but prevention of many major chronic diseases in our patients. Our hypothesis clearly requires further study and testing, but this preliminary study justifies additional investigations into this interesting and significant issue.
We must acknowledge the limitations of this study, including the fact that this was a retrospective, non-controlled study. The instrument we used has not been validated on large or diverse populations, although we did establish preliminary internal consistency and content validity. We recognize that participants were self-selected and may have been biased in their responses by exposure to the information on the website and resources to which they all subscribed. There are discussions of "toxic hunger" versus "true hunger" in the written and web-based materials that participants had access to. Participants were, however, assured of the anonymity of their responses in the introduction to the survey, and the survey responses were received from the Survey Monkey website without any identifying information, including no inclusion of email addresses of those who completed the surveys. It will be important to see if this dramatic shift in hunger perception would be found in populations not exposed to "leading" messages in future studies. We also did not assess the actual diet that each participant typically maintained prior to changing to the high nutrient density diet, nor did we validate the self reports of degree of compliance to the high nutrient density diet. Future studies should include food diaries and measures of biomarkers to quantify these variables more precisely.
However, given these limitations, the number of participants and highly significant test statistics provide leads for future studies that are better controlled and prospective in design and some important clinical insights. Further studies should explore the physiological and neurohormonal correlates of "toxic hunger" and of "true hunger", including measures of oxidative stress and ghrelin levels in people who adhere to the high nutrient density diet and the previous usual diet. It would also be helpful to examine how long the typical "withdrawal phase" from the previous usual diet lasts as people shift to the high nutrient density diet. This information would be valuable in our clinical efforts to support those who are making the change to healthier eating patterns.
We found significant differences in the symptoms, location and unpleasantness of hunger on the high nutrient density diet compared to the participants' previous usual diet in a large sample of people who had made the shift to a diet high in micronutrients and lower in calories. Hunger is one of the major impediments to successful weight loss. Our findings suggest that it is not simply the caloric content, but more importantly, the micronutrient density of a diet that influences the experience of hunger. It appears that a high nutrient density diet, after an initial phase of adjustment during which a person experiences "toxic hunger" due to withdrawal from pro-inflammatory foods, can result in a sustainable eating pattern that leads to weight loss and improved health. Further studies are needed to confirm these preliminary findings that may have important implications in the global effort to control rates of obesity and related chronic diseases.
- Chobotova K: Aging and Cancer: Converging Routes to Disease Prevention. Integrative Cancer Therapies. 2009, 8: 115-122.PubMedGoogle Scholar
- Devaraj S, Wang-Polagruto J, Polagruto J, Keen CL, Jialal I, Devaraj S, Wang-Polagruto J, Polagruto J, Keen CL, Jialal I: High-fat, energy-dense, fast-food-style breakfast results in an increase in oxidative stress in metabolic syndrome. Metabolism: Clinical & Experimental. 2008, 57: 867-870.View ArticleGoogle Scholar
- Egger G, Dixon J: Inflammatory effects of nutritional stimuli: further support for the need for a big picture approach to tackling obesity and chronic disease. Obesity Reviews. 11: 137-149. 10.1111/j.1467-789X.2009.00644.x.Google Scholar
- Esmaillzadeh A, Azadbakht L, Esmaillzadeh A, Azadbakht L: Major dietary patterns in relation to general obesity and central adiposity among Iranian women. Journal of Nutrition. 2008, 138: 358-363.PubMedGoogle Scholar
- Devaraj S, Mathur S, Basu A, Aung HH, Vasu VT, Meyers S, Jialal I, Devaraj S, Mathur S, Basu A, et al: A dose-response study on the effects of purified lycopene supplementation on biomarkers of oxidative stress. Journal of the American College of Nutrition. 2008, 27: 267-273.View ArticlePubMedPubMed CentralGoogle Scholar
- Esmaillzadeh A, Azadbakht L, Esmaillzadeh A, Azadbakht L: Dietary flavonoid intake and cardiovascular mortality. British Journal of Nutrition. 2008, 100: 695-697. 10.1017/S0007114508945700.View ArticlePubMedGoogle Scholar
- Esmaillzadeh A, Kimiagar M, Mehrabi Y, Azadbakht L, Hu FB, Willett WC: Fruit and vegetable intakes, C-reactive protein, and the metabolic syndrome. American Journal of Clinical Nutrition. 2006, 84: 1489-1497.PubMedGoogle Scholar
- O'Keefe JH, Gheewala NM, O'Keefe JO, O'Keefe JH, Gheewala NM, O'Keefe JO: Dietary strategies for improving post-prandial glucose, lipids, inflammation, and cardiovascular health. Journal of the American College of Cardiology. 2008, 51: 249-255. 10.1016/j.jacc.2007.10.016.View ArticlePubMedGoogle Scholar
- Bose KS, Agrawal BK, Bose KSC: Effect of lycopene from tomatoes (cooked) on plasma antioxidant enzymes, lipid peroxidation rate and lipid profile in grade-I hypertension. Annals of Nutrition & Metabolism. 2007, 51: 477-481.View ArticleGoogle Scholar
- Thompson HJ, Heimendinger J, Haegele A, Sedlacek SM, Gillette C, O'Neill C, Wolfe P, Conry C: Effect of increased vegetable and fruit consumption on markers of oxidative cellular damage. Carcinogenesis. 1999, 20: 2261-2266. 10.1093/carcin/20.12.2261.View ArticlePubMedGoogle Scholar
- Bello NT, Hajnal A: Dopamine and binge eating behaviors. Pharmacology Biochemistry and behavior. 2010, Corrected Proof,Google Scholar
- Berthoud HR: Neural control of appetite: cross-talk between homeostatic and non-homeostatic systems. Appetite. 2004, 43: 315-317. 10.1016/j.appet.2004.04.009.View ArticlePubMedGoogle Scholar
- SurveyMonkey.com: Survey Monkey. Palo Alto, CAGoogle Scholar
- Friedman MI, Ulrich P, Mattes RD: A Figurative Measure of Subjective Hunger Sensations. Appetite. 1999, 32: 395-404. 10.1006/appe.1999.0230.View ArticlePubMedGoogle Scholar
- Karlsson J, Persson LO, Sjostrom L, Sullivan M: Psychometric properties and factor structure of the Three-Factor Eating Questionnaire (TFEQ) in obese men and women. Results from the Swedish Obese Subjects (SOS) study. International Journal of Obesity & Related Metabolic Disorders: Journal of the International Association for the Study of Obesity. 2000, 24: 1715-1725.View ArticleGoogle Scholar
- Lowe MR, Friedman MI, Mattes R, Kopyt D, Gayda C: Comparison of verbal and pictorial measures of hunger during fasting in normal weight and obese subjects. Obesity Research. 2000, 8: 566-574. 10.1038/oby.2000.73.View ArticlePubMedGoogle Scholar
- Gibbons JD: Nonparametric statistics: an introduction. 1993, Newbury Park, CA: SageView ArticleGoogle Scholar
- Sarter B, Campbell T, Fuhrman J: Effect of a high-nutrient density diet on long-term weight loss: a retrospective chart review. Alternative Therapies Health Med. 2008, 14: 48-51.Google Scholar
- Thompson HJ, Heimendinger J, Gillette C, Sedlacek SM, Haegele A, O'Neill C, Wolfe P, Thompson HJ, Heimendinger J, Gillette C, et al: In vivo investigation of changes in biomarkers of oxidative stress induced by plant food rich diets. Journal of Agricultural & Food Chemistry. 2005, 53: 6126-6132.View ArticleGoogle Scholar
- Peairs AT, Rankin JW, Peairs AT, Rankin JW: Inflammatory response to a high-fat, low-carbohydrate weight loss diet: effect of antioxidants. Obesity. 2008, 16: 1573-1578. 10.1038/oby.2008.252.View ArticlePubMedGoogle Scholar
- Patel C, Ghanim H, Ravishankar S, Sia CL, Viswanathan P, Mohanty P, Dandona P, Patel C, Ghanim H, Ravishankar S, et al: Prolonged reactive oxygen species generation and nuclear factor-kappaB activation after a high-fat, high-carbohydrate meal in the obese. Journal of Clinical Endocrinology & Metabolism. 2007, 92: 4476-4479.View ArticleGoogle Scholar
- Khansari N, Shakiba Y, Mahmoudi M: Chronic inflammation and oxidative stress as a major cause of age-related diseases and cancer. Recent Pat Inflamm Allergy Drug Discov. 2009, 3: 73-80. 10.2174/187221309787158371.View ArticlePubMedGoogle Scholar
- Federico A, Morgillo F, Tuccillo C, Ciardiello F, Loguercio C, Federico A, Morgillo F, Tuccillo C, Ciardiello F, Loguercio C: Chronic inflammation and oxidative stress in human carcinogenesis. International Journal of Cancer. 2007, 121: 2381-2386. 10.1002/ijc.23192.View ArticlePubMedGoogle Scholar
- Willcox JK, Ash SL, Catignani GL, Willcox JK, Ash SL, Catignani GL: Antioxidants and prevention of chronic disease. Critical Reviews in Food Science & Nutrition. 2004, 44: 275-295.View ArticleGoogle Scholar
- Guo W, Kong E, Meydani M, Guo W, Kong E, Meydani M: Dietary polyphenols, inflammation, and cancer. Nutrition & Cancer. 2009, 61: 807-810.View ArticleGoogle Scholar
- Vives-Bauza C, Anand M, Shirazi AK, Magrane J, Gao J, Vollmer-Snarr HR, Manfredi G, Finnemann SC, Vives-Bauza C, Anand M, et al: The age lipid A2E and mitochondrial dysfunction synergistically impair phagocytosis by retinal pigment epithelial cells. Journal of Biological Chemistry. 2008, 283: 24770-24780. 10.1074/jbc.M800706200.View ArticlePubMedPubMed CentralGoogle Scholar
- Bockowski L, Sobaniec W, Kulak W, Smigielska-Kuzia J, Bockowski L, Sobaniec W, Kulak W, Smigielska-Kuzia J: Serum and intraerythrocyte antioxidant enzymes and lipid peroxides in children with migraine. Pharmacological Reports: PR. 2008, 60: 542-548.PubMedGoogle Scholar
- Johnson PM, Kenny PJ, Johnson PM, Kenny PJ: Dopamine D2 receptors in addiction-like reward dysfunction and compulsive eating in obese rats. Nature Neuroscience. 2010, 13: 635-641. 10.1038/nn.2519.View ArticlePubMedPubMed CentralGoogle Scholar
- Scanlan N: Compromised hepatic detoxification in companion animals and its correction via nutritional supplementation and modified fasting. Alternative Medicine Review. 2001, 6 (Suppl): S24-37.PubMedGoogle Scholar
- Blumenthal DM, Gold MS, Blumenthal DM, Gold MS: Neurobiology of food addiction. Current Opinion in Clinical Nutrition & Metabolic Care. 2010, 13: 359-365.View ArticleGoogle Scholar
- Cohen DA, Cohen DA: Neurophysiological pathways to obesity: below awareness and beyond individual control. Diabetes. 2008, 57: 1768-1773. 10.2337/db08-0163.View ArticlePubMedPubMed CentralGoogle Scholar
- Corwin RL, Grigson PS, Corwin RL, Grigson PS: Symposium overview--Food addiction: fact or fiction?. Journal of Nutrition. 2009, 139: 617-619. 10.3945/jn.108.097691.View ArticlePubMedPubMed CentralGoogle Scholar
- Dagher A: The neurobiology of appetite: hunger as addiction. International Journal of Obesity. 2009, 33 (Suppl 2): S30-33. 10.1038/ijo.2009.69.View ArticlePubMedGoogle Scholar
- Davis C, Carter JC: Compulsive overeating as an addiction disorder. A review of theory and evidence. Appetite. 2009, 53: 1-8. 10.1016/j.appet.2009.05.018.View ArticlePubMedGoogle Scholar
- Del Parigi A, Chen K, Salbe AD, Reiman EM, Tataranni PA: Are We Addicted to Food?. Obesity. 2003, 11: 493-495. 10.1038/oby.2003.68.View ArticleGoogle Scholar
- Gosnell BA, Levine AS: Reward systems and food intake: role of opioids. International Journal of Obesity. 2009, 33 (Suppl 2): S54-58. 10.1038/ijo.2009.73.View ArticlePubMedGoogle Scholar
- Ifland JR, Preuss HG, Marcus MT, Rourke KM, Taylor WC, Burau K, Jacobs WS, Kadish W, Manso G: Refined food addiction: a classic substance use disorder. Medical Hypotheses. 2009, 72: 518-526. 10.1016/j.mehy.2008.11.035.View ArticlePubMedGoogle Scholar
- Johnson PM, Kenny PJ: Dopamine D2 receptors in addiction-like reward dysfunction and compulsive eating in obese rats. Nat Neurosci. 2010, advance online publicationGoogle Scholar
- Liu Y, von Deneen KM, Kobeissy FH, Gold MS, Liu Y, von Deneen KM, Kobeissy FH, Gold MS: Food addiction and obesity: evidence from bench to bedside. Journal of Psychoactive Drugs. 42: 133-145.Google Scholar
- Pelchat ML, Pelchat ML: Food addiction in humans. Journal of Nutrition. 2009, 139: 620-622. 10.3945/jn.108.097816.View ArticlePubMedGoogle Scholar
- Spring B, Schneider K, Smith M, Kendzor D, Appelhans B, Hedeker D, Pagoto S, Spring B, Schneider K, Smith M, et al: Abuse potential of carbohydrates for overweight carbohydrate cravers. Psychopharmacology. 2008, 197: 637-647. 10.1007/s00213-008-1085-z.View ArticlePubMedPubMed CentralGoogle Scholar
- Yanover T, Sacco WP: Eating beyond satiety and body mass index. Eating & Weight Disorders: EWD. 2008, 13: 119-128.View ArticlePubMedGoogle Scholar
- Yeomans MR, Yeomans MR: Alcohol, appetite and energy balance: is alcohol intake a risk factor for obesity?. Physiology & behavior. 100: 82-89.Google Scholar
- Olusi SO: Obesity is an independent risk factor for plasma lipid peroxidation and depletion of erythrocyte cytoprotectic enzymes in humans. International Journal of Obesity & Related Metabolic Disorders: Journal of the International Association for the Study of Obesity. 2002, 26: 1159-1164.View ArticleGoogle Scholar
- Arumugam V, Lee JS, Nowak JK, Pohle RJ, Nyrop JE, Leddy JJ, Pelkman CL, Arumugam V, Lee JS, Nowak JK, et al: A high-glycemic meal pattern elicited increased subjective appetite sensations in overweight and obese women. Appetite. 2008, 50: 215-222. 10.1016/j.appet.2007.07.003.View ArticlePubMedGoogle Scholar
- Fajcsak Z, Gabor A, Kovacs V, Martos E, Fajcsak Z, Gabor A, Kovacs V, Martos E: The effects of 6-week low glycemic load diet based on low glycemic index foods in overweight/obese children--pilot study. Journal of the American College of Nutrition. 2008, 27: 12-21.View ArticlePubMedGoogle Scholar
- Flint A, Gregersen NT, Gluud LL, Moller BK, Raben A, Tetens I, Verdich C, Astrup A, Flint A, Gregersen NT, et al: Associations between postprandial insulin and blood glucose responses, appetite sensations and energy intake in normal weight and overweight individuals: a meta-analysis of test meal studies. British Journal of Nutrition. 2007, 98: 17-25. 10.1017/S000711450768297X.View ArticlePubMedGoogle Scholar
- Harrington S, Harrington S: The role of sugar-sweetened beverage consumption in adolescent obesity: a review of the literature. Journal of School Nursing. 2008, 24: 3-12. 10.1177/10598405080240010201.View ArticlePubMedGoogle Scholar
- Bosch G, Verbrugghe A, Hesta M, Holst JJ, van der Poel AF, Janssens GP, Hendriks WH: The effects of dietary fibre type on satiety-related hormones and voluntary food intake in dogs. ritish Journal of Nutrition. 2009, 102: 318-325. 10.1017/S0007114508149194.View ArticleGoogle Scholar
- Cotton JR, Burley VJ, Weststrate JA, Blundell JE, Cotton JR, Burley VJ, Weststrate JA, Blundell JE: Dietary fat and appetite: similarities and differences in the satiating effect of meals supplemented with either fat or carbohydrate. Journal of Human Nutrition & Dietetics. 2007, 20: 186-199.View ArticleGoogle Scholar
- Duckworth LC, Gately PJ, Radley D, Cooke CB, King RF, Hill AJ, Duckworth LC, Gately PJ, Radley D, Cooke CB, et al: RCT of a high-protein diet on hunger motivation and weight-loss in obese children: an extension and replication. Obesity. 2009, 17: 1808-1810. 10.1038/oby.2009.95.View ArticlePubMedGoogle Scholar
- Flood-Obbagy JE, Rolls BJ, Flood-Obbagy JE, Rolls BJ: The effect of fruit in different forms on energy intake and satiety at a meal. Appetite. 2009, 52: 416-422. 10.1016/j.appet.2008.12.001.View ArticlePubMedGoogle Scholar
- Gilbert JA, Drapeau V, Astrup A, Tremblay A, Gilbert JA, Drapeau V, Astrup A, Tremblay A: Relationship between diet-induced changes in body fat and appetite sensations in women. Appetite. 2009, 52: 809-812. 10.1016/j.appet.2009.04.003.View ArticlePubMedGoogle Scholar
- Lemieux S, Lapointe A, Lemieux S, Lapointe A: Dietary approaches to manage body weight. Canadian Journal of Dietetic Practice & Research. 2008, 69: 3-p following 26Google Scholar
- Lindqvist A, Baelemans A, Erlanson-Albertsson C, Lindqvist A, Baelemans A, Erlanson-Albertsson C: Effects of sucrose, glucose and fructose on peripheral and central appetite signals. Regulatory Peptides. 2008, 150: 26-32. 10.1016/j.regpep.2008.06.008.View ArticlePubMedGoogle Scholar
- Lyly M, Liukkonen KH, Salmenkallio-Marttila M, Karhunen L, Poutanen K, Lahteenmaki L, Lyly M: Fibre in beverages can enhance perceived satiety. European Journal of Nutrition. 2009, 48: 251-258. 10.1007/s00394-009-0009-y.View ArticlePubMedGoogle Scholar
- Monsivais P, Perrigue MM, Drewnowski A, Monsivais P, Perrigue MM, Drewnowski A: Sugars and satiety: does the type of sweetener make a difference?. American Journal of Clinical Nutrition. 2007, 86: 116-123.PubMedGoogle Scholar
- Niwano Y, Adachi T, Kashimura J, Sakata T, Sasaki H, Sekine K, Yamamoto S, Yonekubo A, Kimura S, Niwano Y, et al: Is glycemic index of food a feasible predictor of appetite, hunger, and satiety?. Journal of Nutritional Science & Vitaminology. 2009, 55: 201-207.View ArticleGoogle Scholar
- Parra D, Ramel A, Bandarra N, Kiely M, Martinez JA, Thorsdottir I, Parra D, Ramel A, Bandarra N, Kiely M, et al: A diet rich in long chain omega-3 fatty acids modulates satiety in overweight and obese volunteers during weight loss. Appetite. 2008, 51: 676-680. 10.1016/j.appet.2008.06.003.View ArticlePubMedGoogle Scholar
- Rodriguez-Rodriguez E, Aparicio A, Bermejo LM, Lopez-Sobaler AM, Ortega RM: Changes in the sensation of hunger and well-being before and after meals in overweight/obese women following two types of hypoenergetic diet. Public Health Nutrition. 2009, 12: 44-50. 10.1017/S1368980008001912.View ArticlePubMedGoogle Scholar
- Sacks FM, Bray GA, Carey VJ, Smith SR, Ryan DH, Anton SD, McManus K, Champagne CM, Bishop LM, Laranjo N, et al: Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates. New England Journal of Medicine. 2009, 360: 859-873. 10.1056/NEJMoa0804748.View ArticlePubMedPubMed CentralGoogle Scholar
- Aston LM, Stokes CS, Jebb SA: No effect of a diet with a reduced glycaemic index on satiety, energy intake and body weight in overweight and obese women. International Journal of Obesity. 2008, 32: 160-165. 10.1038/sj.ijo.0803717.View ArticlePubMedGoogle Scholar
- Major GC, Doucet E, Jacqmain M, St-Onge M, Bouchard C, Tremblay A, Major GC, Doucet E, Jacqmain M, St-Onge M, et al: Multivitamin and dietary supplements, body weight and appetite: results from a cross-sectional and a randomised double-blind placebo-controlled study. British Journal of Nutrition. 2008, 99: 1157-1167. 10.1017/S0007114507853335.View ArticlePubMedGoogle Scholar
- Ames BN: Micronutrients prevent cancer and delay aging. Toxicology Letters. 1998, 102-103: 5-18. 10.1016/S0378-4274(98)00269-0.View ArticlePubMedGoogle Scholar
- Astley SB, Elliott RM, Archer DB, Southon S, Astley SB, Elliott RM, Archer DB, Southon S: Increased cellular carotenoid levels reduce the persistence of DNA single-strand breaks after oxidative challenge. Nutrition & Cancer. 2002, 43: 202-213.View ArticleGoogle Scholar
- Aviram M, Kaplan M, Rosenblat M, Fuhrman B: Dietary antioxidants and paraoxonases against LDL oxidation and atherosclerosis development. Handbook of Experimental Pharmacology. 2005, 263-300. full_text.Google Scholar
- Collins AR, Harrington V, Drew J, Melvin R, Collins AR, Harrington V, Drew J, Melvin R: Nutritional modulation of DNA repair in a human intervention study. Carcinogenesis. 2003, 24: 511-515. 10.1093/carcin/24.3.511.View ArticlePubMedGoogle Scholar
- Ferguson LR, Philpott M, Karunasinghe N, Ferguson LR, Philpott M, Karunasinghe N: Dietary cancer and prevention using antimutagens. Toxicology. 2004, 198: 147-159. 10.1016/j.tox.2004.01.035.View ArticlePubMedGoogle Scholar
- Joseph JA, Denisova NA, Bielinski D, Fisher DR, Shukitt-Hale B: Oxidative stress protection and vulnerability in aging: putative nutritional implications for intervention. Mechanisms of Ageing & Development. 2000, 116: 141-153.View ArticleGoogle Scholar
- Martin KR, Failla ML, Smith JC: Beta-carotene and lutein protect HepG2 human liver cells against oxidant-induced damage. Journal of Nutrition. 1996, 126: 2098-2106.PubMedGoogle Scholar
- O'Brien NM, Carpenter R, O'Callaghan YC, O'Grady MN, Kerry JP, O'Brien NM, Carpenter R, O'Callaghan YC, O'Grady MN, Kerry JP: Modulatory effects of resveratrol, citroflavan-3-ol, and plant-derived extracts on oxidative stress in U937 cells. Journal of Medicinal Food. 2006, 9: 187-195. 10.1089/jmf.2006.9.187.View ArticlePubMedGoogle Scholar
- O'Brien NM, Woods JA, Aherne SA, O'Callaghan YC: Cytotoxicity, genotoxicity and oxidative reactions in cell-culture models: modulatory effects of phytochemicals. Biochemical Society Transactions. 2000, 28: 22-26.View ArticlePubMedGoogle Scholar
- Prior RL, Prior RL: Fruits and vegetables in the prevention of cellular oxidative damage. American Journal of Clinical Nutrition. 2003, 78: 570S-578S.PubMedGoogle Scholar
- Schaefer S, Baum M, Eisenbrand G, Janzowski C, Schaefer S, Baum M, Eisenbrand G, Janzowski C: Modulation of oxidative cell damage by reconstituted mixtures of phenolic apple juice extracts in human colon cell lines. Molecular Nutrition & Food Research. 2006, 50: 413-417.View ArticleGoogle Scholar
- Singh M, Arseneault M, Sanderson T, Murthy V, Ramassamy C, Singh M, Arseneault M, Sanderson T, Murthy V, Ramassamy C: Challenges for research on polyphenols from foods in Alzheimer's disease: bioavailability, metabolism, and cellular and molecular mechanisms. Journal of Agricultural & Food Chemistry. 2008, 56: 4855-4873.View ArticleGoogle Scholar
- Sudheer AR, Muthukumaran S, Devipriya N, Menon VP, Sudheer AR, Muthukumaran S, Devipriya N, Menon VP: Ellagic acid, a natural polyphenol protects rat peripheral blood lymphocytes against nicotine-induced cellular and DNA damage in vitro: with the comparison of N-acetylcysteine. Toxicology. 2007, 230: 11-21. 10.1016/j.tox.2006.10.010.View ArticlePubMedGoogle Scholar
- Tarozzi A, Hrelia S, Angeloni C, Morroni F, Biagi P, Guardigli M, Cantelli-Forti G, Hrelia P: Antioxidant effectiveness of organically and non-organically grown red oranges in cell culture systems. European Journal of Nutrition. 2006, 45: 152-158. 10.1007/s00394-005-0575-6.View ArticlePubMedGoogle Scholar
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