Is Your Sweet Tooth Genetic? What Science Says About Food Preferences

People with specific gene variants that shape their preference for sweet or fatty foods may face a higher risk of developing obesity and type 2 diabetes, according to a large-scale data analysis presented at the American Society for Nutrition’s annual meeting. The research, which analyzed data from nearly 500,000 participants in the UK Biobank, marks one of the largest genetic association studies ever conducted on taste preferences.

How Genetic Variants Shape Food Preferences

Researchers combined questionnaire data on food preferences with genetic information from nearly 500,000 UK Biobank participants to build a score capturing each person’s genetic predisposition to specific tastes. According to the findings, individuals with a higher genetic score for sweet foods consumed about 7 grams more of those items daily. Sandra Zhang, RD, a nutritionist at the Frances Stern Nutrition Center at Tufts Medical Center in Boston who was not involved in the study, notes that these findings clarify why eating habits extend beyond simple willpower. Genetics can influence how strongly people enjoy certain tastes, altering food choices over time, Zhang explains.

Participants carrying higher genetic scores for sweet and fat taste preferences also demonstrated a higher body weight and a slightly elevated risk of type 2 diabetes. Scott Keatley, RD, a New York City dietitian-nutritionist and co-owner of Keatley Medical Nutrition Therapy, states that genetics impact taste receptors, reward pathways, appetite regulation, and food satisfaction. Keatley adds that epigenetics—modifications in how genes activate or deactivate without altering the underlying DNA sequence—may also shape these preferences through early nutrition, sleep, stress, and long-term eating habits.

Managing Health Risks Beyond Genetics

Experts emphasize that carrying a genetic predisposition does not destine an individual to specific health outcomes. Ali points out that behavioral changes can effectively alter health trajectories even when a genetic inclination exists. Zhang recommends implementing gradual adjustments, such as reducing portion sizes, consuming smaller treats, sharing portions, or pairing sweets with protein- or fiber-rich foods to enhance satiety. Over time, taste preferences can adapt, making intensely sweet or rich foods less appealing.

For individuals struggling with persistent food noise that disrupts a healthy lifestyle, Ali suggests consulting a healthcare provider for initial blood work to check for endocrine disorders. If underlying issues are absent, providers may recommend GLP-1 medications like semaglutide or tirzepatide to help suppress appetite and quiet food noise. Keatley stresses that lifestyle remains the strongest tool for modifying long-term health risks, proving that biology is only one component of overall dietary health.

Frequently Asked Questions

Can genetic testing identify my food preferences?

Genetic testing for taste preferences is not straightforward and is rarely covered by medical insurance unless specific diagnostic reasons exist, according to Dr. Mir Ali.

Do I have a genetic variant if I have a sweet tooth?

Not necessarily. While a preference for sweet or fatty foods can run in families, Sandra Zhang notes that overall desire is complex and shaped by environment, culture, habits, and food availability rather than genetics alone.

Can I change my taste preferences over time?

Yes. Experts state that taste preferences can adapt when people gradually reduce their intake of intensely sweet or rich foods, pair treats with protein or fiber, and decrease portion sizes.

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