Genes Influence Diet Choices and Metabolic Health, New Research Suggests

National Harbor, Md. (July 27, 2026) — Some people seem naturally drawn to sweets and fatty foods, while others can easily pass them up. New preliminary findings from a large genetics effort suggest that this variation is not only behavioral, but partly rooted in DNA. Researchers report that genetic variants linked to sweetness and fat preference may increase both hyperpalatable food intake and susceptibility to obesity and type 2 diabetes.

The study draws on the UK Biobank, which contains genetic data and health- and diet-related questionnaires for roughly half a million participants. Because taste preferences are difficult to measure at scale, the team used a combined strategy that paired self-reported food preference information with sensory databases describing sweetness, saltiness, and “fatty” taste characteristics.

Rather than treating each taste item separately, the researchers derived taste preference traits for sweet, salty, and fatty taste, then performed genome-wide association analyses to identify DNA variants associated with each preference. They consolidated these signals into a single genetic score reflecting cumulative predisposition toward sweet and fat preferences.

To test whether the scores predicted real-world eating, the team used a separate UK Biobank subset. Participants with higher genetic predisposition for sweet preference, for instance, were expected to consume more sweet foods such as desserts and sugary drinks. The analyses also adjusted for age, sex, genetic ancestry, and total energy intake to isolate effects linked to taste genetics.

Results indicate that higher sweet-preference genetic scores corresponded to greater sweet food intake—about 7 grams per day on average. Even small day-to-day differences could accumulate over time, potentially shaping long-term metabolic outcomes.

In parallel, higher genetic scores for sweet and fatty preference were associated with higher body weight and a modest increase in type 2 diabetes risk. Crucially, the researchers found these metabolic associations were largely explained by increased consumption of hyperpalatable foods.

The work suggests that genes influencing taste perception may act upstream of diet quality, thereby contributing to chronic disease risk. If replicated in other cohorts, the findings could help identify people who may benefit from earlier, targeted lifestyle support.

The study also points toward more personalized interventions. For individuals with a stronger genetic tendency toward sweetness, strategies that specifically address sweet cravings—potentially including behavioral tools or culinary approaches—may outperform generic dietary advice.

Finally, the team is extending this research to other taste modalities (bitter, sour, and umami) and exploring whether taste-preference genetics affects responses to metabolic medications, including GLP-1 agonists, which can alter taste and eating behavior in some patients.