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Table 1 Interview/focus group questions asked to participants in accordance with the TDF and COM-B model

From: Comparison of barriers and facilitators of MIND diet uptake among adults from Northern Ireland and Italy

COM-B

TDF

QUESTION

Psychological Capability

Knowledge.

What is your understanding of the MIND diet?

Psychological Capability

Memory, attention and decision processes.

To what extent is eating MIND diet foods something you normally do?

➢ Prompt: Do you eat MIND diet foods each day

Psychological Capability

Behaviour regulation

To what extent do you monitor whether you are eating MIND die foods?

Physical

Capability

Skills

To what extent are you confident in cooking/eating MIND diet foods?

Social Opportunity

Social influences

To what extent do/would your family or friends help or hinder you eating MIND diet foods?

➢ Prompt: Does/would your family support you in eating the MIND diet?

Physical Opportunity

Environmental context and resources.

Discuss anything in your work or/and home environment that might help or hinder you eating the MIND diet? E.g budget, time

Reflective Motivation

Social/Professional role and identity

To what extent would eating the MIND diet be accepted by your friends and family?

➢ Prompt: Do you think your family/friends influences what you eat?

Reflective Motivation

Belief about capabilities

How difficult/easy would it be for you to eat the MIND diet?

➢ Prompt: What are the barriers to consuming the MIND diet?

➢ Prompt: What are the facilitators to consuming the MIND diet?

Reflective Motivation

Optimism

To what extent are you confident that any barriers you may have to eating the MIND diet can be solved?

Reflective Motivation

Intention

To what extent do you intend to follow the MIND diet to promote brain health?

Reflective Motivation

Goals

To what extent would you like to follow the MIND diet?

Reflective Motivation

Belief about consequences

What do you think will happen if you eat the MIND diet?

➢ Prompt: Discuss any benefits to eating the MIND diet?

Automatic Motivation

Reinforcement

To what extent are there any incentives for you to the MIND diet?

Automatic

Motivation

Emotion

How do you feel about eating the MIND diet?

  1. COM-B Capability (C): Psychological or physical ability to enact behaviour, Opportunity (O) Physical and social environment that enables behaviour, Motivation (M) Reflective or automatic mechanisms that activate or inhibit behaviour, Behaviour (B), TDF Theoretical Domains Framework [45].