Data collection
A close-ended quantitative survey consisting of multiple-choice questions about perceptions, attitudes, beliefs towards soya, and motivators and barriers to regular soya consumption was designed from qualitative data collected from a feasibility study. In the feasibility study, ten Asian women with the same selection criteria as the MiSo Study were asked to consume 100 mg of soya for 2 months and were then invited for a semi-structured interview at the end of the first month to explore the motivators and barriers to participation in a dietary soya intervention study. The themes identified were mapped to the COM-B model and TDF (Supplementary Table S1). Within the COM-B model, capability relates to the physical or psychological skills and ability of an individual to carry out a behaviour. Opportunity relates to the external physical and social influences that drive behaviour change. Finally, motivation refers to the intrinsic processes that influence decision-making and behaviours, such as reflective motivation (i.e. reflective processes such as making plans) and automatic motivation (i.e. desires, impulses and inhibitions).The survey was administered to all participants (