Table 1.

Topic guide for semi-structured interviews t₀

TDF-Domain	Main questions
	1. What is a healthy diet for you?
Knowledge, Skills	2. Where have you learned about healthy eating?
Nature of behavior, Importance	3. How important is it for you to eat healthily? ➢ If so: What are you doing to eat healthily? ➢ If not: Why isn’t it important to you?
Beliefs about consequences	4. In what ways do you think nutrition can affect your health?
Beliefs about capabilities, Environmental context and resources, Social influence, Social role, Motivation and goals, Skills	5. What factors impact your eating behavior? ➢ What influence do family members and friends have? ➢ Do you have certain rituals or customs concerning your eating behavior? ➢ Is your culture or religion affecting your eating behavior? ➢ Do you know how to prepare the desired dishes?
Beliefs about capabilities, Environmental context and resources, Skills	6. In which way have your eating habits changed since you moved to Germany? ➢ How satisfied are you with what you eat in Germany? ➢ Do you eat differently now than in Syria? Why? ➢ Can you buy the desired food in your neighborhood? ➢ Are there any “new food items” that you do not know from your home country? ➔ Do you integrate these products into your diet?
Motivation and goals, Environmental context and resources	7. What would help you eat the way you would like to?