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Table 1 Characterized of included studies

From: Effects of weight change on taste function; a systematic review

Author (year)

Study design

Population

Age

Method of Taste assessment

Jilani (2022) [23]

Cross-sectional

1938 children

7–11

Taste threshold: 5 watery solutions prepared with distilled water, with ascending concentrations of sucrose (8.8–46.7 mmol/l, sweet), sodium chloride (3.4–27.4 mmol/l, salty), monosodium glutamate (0.6–9.5 mmol/l, umami) or caffeine (0.26–1.3 mmol/l, bitter)/ using the paired comparison staircase method

Costanzo (2021) [24]

Cross-sectional

36 men and women

18–55

Taste threshold: twelve concentrations of oligofructose solutions determined using a validated ascending forced choice triangle methodology

Nishihara (2019) [17]

Intervention

Parallel

Women: 27 obesity, overweight/ 24 normal weight

21–64

Taste threshold: Two-alternative, forced choice staircase procedure. Pairs of solutions, one of which was sucrose solution and the other deionized water. The concentration for the sucrose solution began at 1 × 10–4 M. to choose the one they thought contained the sweet taste and continued until the choice were correct based on especial criteria

Taste preference: forced-choice, paired-comparison tracking technique (differed in the concentration of sucrose and ask to choose one preferred)

Vignini (2019) [25]

Case–control

30 normal-weight /19 overweight/22 obesity

 > 32

Taste sensitivity: Filter paper strips / four different concentrations / self- assessment according to a multiple-choice question. Sucrose (.05- 0.4)/ sodium chloride (0.016- 0.25), citric acid (0.05- 0.3)/ quinine hydrochloride (0.0004- 0.006)

Mameli (2019) [26]

Case–control

children:34Obese /33 normal weight

6–14

Taste sensitivity: ‘Taste Strips’ method. Total number of 18 paper strips were used/ four different concentrations for each taste qualities (sweet, sour, salty and bitter) and two blank strips/self- assessment according to a multiple-choice question

Uygun (2019) [18]

Case–control

52obese/15 normal weight women

18–55

Taste threshold: sucrose concentrations (1.25 * 103 to 6.4 * 101 M)/ scale from 1 to 4

Proserpio (2018) [27]

Case–control

45obese/40 normal weight

18- 65

Taste perception: filter papers (Whatman) were soaked in a saturated aqueous PROP (6-n-propyl-2-thiouracil) / Comparing the average perceived bitterness of PROP papers with those of PROP solutions, PROP paper falls between the perceived bitterness of 0.001 and 0.0032 M PROP

Noel (2017) [28]

Cohort

93

young adults

Taste intensity: Three concentrations/ gLMS scale

Sucrose (27.0, 81.0, and 243.0 mmol/L) / sodium chloride (33.3, 100.0, and 300.0 mmol/L)/ citric acid concentrations (1.0, 3.0, and 9.0 mmol/L)/ quinine concentrations (0.056, 0.168, and 0.498 mmol/L.)

Hardikar (2017) [29]

Case–control

23 obese (OB; BMI > 30), and 31 lean

18–35

Taste threshold: Using different concentrations/ adaptive Bayesian staircase procedure (QUEST) were continued until correct answer (sucrose, NaCl, citric acid, quinine)

Fernandez-Garcia (2017) [22]

Case–control

17 Low weight / 77 normal weight / 12 overweight/ 28 obesity/ 45 morbid obesity

18–65

Taste sensitivity: Taste strips/ The strips were placed on the left and right sides of the anterior third of the extended tongue/ Using different concentrations. 0.4- 0.05 g/ml sucrose/ 0.3- 0.05 g/ ml citric acid/ 0.25- 0.016 g/ml sodium chloride/ 0.006- 0.0004 g/ml quinine hydrochloride

Burgess (2016) [19]

Intervention

(Low carbohydrate /low fat diet)

Women: 69 obese

44.2

Taste threshold: Strawberry milk varying in sucrose (0%, 15% and 30% wt/vol) / visual analogue scale

Taste preference: salad dressing fat (10%, 30%, 50% wt/vol) / visual analogue scale

Newman (2016) [13]

Intervention

53 Overweight and obese

18–75

Taste thresholds: using triangle tests with ascending forced choice

Taste preference: different foods including cream cheese, vanilla yogurt, chocolate mousse. / 9-point hedonic scale

Sauer (2016) [30]

Intervention

60 Obese/27 normal weight

9–17

Taste perception: Taste strip/ 4 different concentrations which have been conducted by filter paper / self- assessment according to a multiple-choice question

0.4—0.05 g/mL sucrose/ 0.3- 0.05 g/mL citric acid/ 0.25–0.016 g/mL sodium chloride/ 0.006–0.0004 g/mL quinine-hydrochloride

Subjective taste preferences: asking if participants had a preferred taste

Proserpio (2016) [31]

Case–control

51 obese/ 52 normal weight

40.17 ± 10.79

Taste sensitivity: Seven concentrations of Sucrose, caffeine, sodium chloride, citric acid, and oleic acid were prepared in mineral water

Sucrose (0.16- 40) / Sodium chloride (0.06 – 4)/ Caffeine (0.003 – 2) / Citric acid (0.33 – 50) / Oleic acid (0.02- 30) Taste thresholds: 3-AFC method

Ferna´ndez-Aranda (2016) [32]

Case–control

Women: 59 obese /36 normal weight

37.5

Taste sensitivity: Taste strips/ The strips were placed on the left and right sides of the anterior third of the extended tongue. Using different concentrations. 0.4- 0.05 g/ml sucrose/ 0.3- 0.05 g/ ml citric acid/ 0.25- 0.016 g/ml sodium chloride/ 0.006- 0.0004 g/ml quinine hydrochloride

Park (2015) [33]

Case–control

23 normal weight/ 18 overweight

20–29

Taste threshold: Electrogustometry (EGM) method were measured on both sides of the anterior and posterior tongue

bases / 22 different thresholds, ranging from 3 uA (–8 dB) to 400 uA (34 dB), in a manner similar to pure-tone audiometry. /10 different concentrations of sodium chloride (0.016–0.9), sucrose (0.05–0.2), citric acid (0.05- 0.6), quinine hydrochloride (0.00001- 0.03) was administered

Skrandies (2015) [34]

Case–control

11 underweight/ 30 normal weight/ 18 overweight /7 obese

20–65

Tats threshold: Taste strip/ 4 different concentrations which have been conducted by filter paper / visual analogue scale

Bertoli (2014) [35]

Intervention

66 overweight/obese

 > 65

Taste threshold: Three-alternative-forced-choice method. Five concentrations of sucrose, caffeine, sodium chloride and citric acid / 5 triads of samples marked with three-digit numbers

Ettinger (2012) [21]

Case–control

women:50 normal/ 21 overweight

18—49

Taste thresholds: Six concentrations of sucrose solutions (0.2%,—1.2% w/v) using the ascending

forced-choice trial method

Overberg (2012) [12]

Case–control

99 obese/ 94 normal weight

6–18

Taste sensitivity: Taste strips made from filter paper were impregnated with four different concentrations (sweet: 0.4- 0.05 g/ml sucrose; sour: 0.3- 0.05 g/ml citric acid; salty: 0.25–0.016 g/ml Sodium Chloride; umami: 0.25- 0.016 g/ml monosodium glutamate; bitter: 0.006- 0.0004 g/ml quinine-hydrochloride) plus two blank strips / 5-point rating scale

Sartor (2011) [36]

Case–control

Normal weight 22/ overweight, obese 11

22.8 ± 2.5

Taste sensitivity: Eleven concentrations of sucrose (0, 0.5- 2.75 log[sucrose] mol/L) and seven concentrations of sodium chloride (1- 2.5 log [NaCl] mol/L)/ gLMS of intensity (150 mm)

Umabiki (2010) [20]

Intervention

Women: 20 overweight or obese

55

Taste threshold: 10 different concentrations (0.0098 – 50,000%) by forced-choice staircase method

Matsushit (2009) [37]

Cohort

29,103

middle-aged

Taste preference: Kotteri is a word that all Japanese would know, indexing a taste as common as sweet or sour, and described as a rich and heavy taste in Japanese dictionary. / self- assessment according to a multiple-choice question

Pasquet (2007) [38]

Case–control

39 obese/ 48 non-obese

11.5–18

Taste threshold: sucrose (2.0 to 1000 mM), fructose (2.0 to 1000 mM), citric acid (0.40 to 25 mM) and quinine hydrochloride (0.4400 mM), whereas the solutions of sodium chloride (1.77 to 1000 mM) and PROP (15 solutions: 0.0013.2 mM)/ visual analogue scale

Simchen (2006) [39]

Cross-sectional

311 men and women

 < 65

 > 65

Taste sensitivity: Four different concentrations of sodium chloride (3.2- 100 mmol/l), sucrose (0.0032,—0.1 mol/l), citric acid (0.63- 5 mmol/l) and quinine hydrochloride (3.8- 40 mmol/l)/ 0–100 scores by the FIZZ Software

Salbe (2004) [40]

Cohort

123

 > 18

Hedonic response: Solutions of nonfat milk (0.1% fat), whole milk (3.5% fat), half and half (11.3% fat), and cream (37.5% fat) containing 0%, 5%, 10%, or 20% sugar by weight/ 100-mm visual analogue scale

  1. gLMS General Labeled Magnitude Scale, LMS The labeled magnitude scale, EGM Electrogustometry, 3-AFC 3 alternative forced choice