2.1. Study Design

As an initiative developed in the Stanford Prevention Research Center (SPRC), investigators are using WELL to generate comprehensive scientific data to help define, understand, and improve well‐being among people from diverse backgrounds. Based on emergent themes from one hundred semi‐structured qualitative interviews, the WELL survey is a 76‐item instrument, focused on 10 domains of well‐being “paper under review.” As of June 2019, 4,248 women and men, 18 years or older, have completed the survey. Details about the WELL study design, protocol, informed consent measures, and recruitment are available elsewhere “paper under review.”

The present study is a cross‐sectional analysis on 248 WELL study participants who completed both a WELL online survey that included 12 diet‐related questions and a Block FFQ up to one year apart. Completion of the FFQ was optional. Up to four email reminders were sent to encouraged participants to fill out the Block FFQ (Guy et al., ²⁰¹²; Houston et al., ²⁰¹⁰; McLean et al., ²⁰¹⁴).