Table 1 Study timeline and collected data

 Eligibility screening

●

 Informed consent

●

 Allocation to mobile PA app

●

 Control supermarkets

●

●

●

(●)

 Supermarkets with nudges and pricing strategies

●

●

●

(●)

 Participants with control app

●

●

●

(●)

 Participants with mobile PA app

●

●

●

(●)

 Population characteristics

  Age

●

  Sex

●

  Household size

●

  Smoking status

●

  Medical history

●

  Medication use

●

●

●

(●)

 Primary outcome

  Healthy dietary intake

●

●

●

(●)

 Secondary outcomes

  HbA1c

●

●

(●)

  LDL-cholesterol

●

●

(●)

  HDL-cholesterol

●

●

(●)

  Total cholesterol

●

●

(●)

  Total cholesterol/HDL-ratio

●

●

(●)

  Triglycerides

●

●

(●)

  Waist circumference

●

●

(●)

  Healthy dietary intake per food group

●

●

●

(●)

  Healthy food purchases

●

●

●

(●)

  Food decision styles

●

●

●

(●)

  Nudges and social cognitive factors

●

●

●

(●)

  Customer satisfaction

●

●

●

(●)

  Perceptions on healthy eating

●

(●)

  Perceptions during grocery shopping

●

(●)

  Acceptance of nudges

●

(●)

  Walking behaviour

●

●

●

(●)

  Walking behaviour and social cognitive factors

●

●

●

(●)

  Communication coaching app

●

●

(●)

  Use of coaching app

●

●

(●)

  Technology acceptance coaching app

●

●

(●)

  Privacy concerns coaching app

●

(●)

  Self-reported walking behaviour

●

(●)

 Covariates

  Self-control

●

  Digital health literacy

●

●

●

(●)

  Food-related behaviours

●

  Price awareness and perception

●

  Supermarket proximity

●

  Shopping style

●

●

●

(●)

  Shopping at other supermarkets

●

●

●

(●)