New research from City St. George’s, University of London suggests tailoring weight loss support to a person’s eating behavior can boost engagement and adherence in digital programs. A short online quiz sorted participants into four distinct eating profiles and fed back personalized advice, which linked to better participation and tracking. The study tested this approach alongside a 12-week digital weight-loss course and found clear differences in how people responded to phenotype-based guidance.
The quiz asked about emotional eating, dieting habits and exercise through 17 questions, then grouped people into four phenotypes labeled Purple Lavender, Red Chili, Yellow Saffron and Green Sage. Each label corresponds to a behavioral pattern rather than a diet prescription, aiming to make the guidance feel personal and practical. The idea is to meet people where they are emotionally and behaviorally, not just give one-size-fits-all rules.
Participants who identified with a profile recorded more meals, messaged health coaches more often and stayed in the program longer. The study reported “significant” engagement among those who received phenotype-tailored advice compared with those who did not. While short-term weight differences were small and not statistically significant, engagement itself is a big barrier that this method seems to move.
The researchers concluded, “Phenotype-tailored weekly advice was associated with substantially higher engagement in a real-world digital program, although short-term weight differences were not statistically significant.” They also noted limitations: the study was not randomized, relied on self-reported weight and had a relatively short follow-up period. Those caveats mean we should interpret the weight outcomes cautiously, but the behavioral signals are worth attention.
Red Chili is described as “high maladaptive and hedonic eating, low self-regulation and high psychological avoidance.” People in this group may feel out of control around food, use eating to cope with emotions and swing between restrictive dieting and overeating when those diets fail. For them, support that targets emotional coping and breaks cycles of guilt could be the missing piece.
“Yellow Saffron” is based on “high hedonic eating and reward reactivity and low maladaptive eating.” These folks respond strongly to tasty, high-calorie foods and often choose flavor over nutrition, making cravings a constant challenge. Interventions that change food environments, offer satisfying lower-calorie swaps and build quick wins around taste could help here.
“Purple Lavender” represented “low self-regulation and high psychological avoidance, as well as low maladaptive and hedonic eating.” Members of this group often start strong but lose momentum when barriers pop up, and they may shy away from addressing the problems standing in their way. Coaching that focuses on sustaining motivation and problem-solving small obstacles fits this profile.
“Green Sage” is characterized in the quiz as “low maladaptive and hedonic eating, high self-regulation and low psychological avoidance.” These people generally have good eating habits but still struggle with consistent action, like meeting physical activity or vegetable intake targets. Clear guidance and nudges to convert intention into routine are usually what they need.
A registered dietitian-nutritionist praised the quiz as “really intuitive” and said, “It really hits on the emotional and behavioral side of weight loss that people struggle with the most.” She added, “It did an amazing job once it identified your eating type, giving you mindset shifts and descriptors on what to work on,” and called the early motivation boost unsurprising. She also cautioned that researchers “have to work on better follow-up measures” to help people stay consistent over time.
A certified holistic nutritionist agreed that behavior-focused approaches make sense, noting, “Health is an individualized topic. There is no general way of eating that suits each person, because behavior and personality play such a role.” She argued that generic lists of foods to eat or avoid rarely produce lasting change if they ignore personality and habits. That line of thinking is exactly why phenotype-based guidance aims to be actionable, not prescriptive.
In practice, translating these profiles into programs means simple, tailored nudges rather than complex new diets. For heavy emotional eaters that might look like quick skills for distress tolerance; for hedonic eaters it could be practical swaps that keep flavor. The study makes a pragmatic case: when programs align with how people actually think and cope, participation climbs and the stubborn problem of drop-off starts to shrink.
