Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Focus on Diet Quality Over Calorie Counting: Replacing ultra-processed foods with whole foods (vegetables, fruits, legumes, whole grains, lean proteins) tends to lower caloric intake without rigid counting. Higher ultra-processed food intake is associated with higher BMI and waist circumference, while Mediterranean-style patterns are linked to healthier weight. Fiber and protein improve satiety, which can reduce overall food intake. Nutrients (PMC)
Maintain Regular Physical Activity: Exercise alone usually produces modest weight loss but is important for weight maintenance and metabolic health. A common target is 150-300 minutes/week of moderate activity or 75-150 minutes of vigorous activity. Resistance training helps preserve muscle mass during weight loss, which supports resting energy expenditure. Obesity Reviews (PMC)
Prioritize Sleep Quality: Short sleep (<7 hours) is associated with higher ghrelin (a hunger signal), lower leptin (a satiety signal), and reduced insulin sensitivity - a profile linked to weight gain. A systematic review found short sleep associated with weight gain, particularly in younger people. Consistent 7-9 hours of sleep is an underused lever for weight management. Obesity (PMC)
Manage Stress and Emotional Eating: Chronic stress is associated with elevated cortisol, abdominal fat accumulation, and reward-driven 'comfort' eating. Mindfulness-based approaches, cognitive behavioral strategies, and regular physical activity can each help reduce stress-driven overeating. Noticing emotional eating patterns is a useful first step toward addressing them. International Journal of Preventive Medicine (PMC)
Know When to Ask for Help: If sustained lifestyle change has not been enough, that is common and not a personal failure. Body weight is regulated by biology that pushes back against loss. A clinician can look for contributing factors such as thyroid problems, sleep apnoea, or the side effects of existing medication, which is worth doing before assuming effort is the missing ingredient.
How much of this is genetic?
Genetics explains 73% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Min et al. 2013, Obesity Reviews
Background and further reading
Body Mass Index (BMI) is a measurement, not a diagnosis: weight in kilograms divided by height in meters squared. It is a screening tool rather than a direct measure of body fat, and it does not distinguish fat from muscle or account for where fat sits on the body. Even so, it remains the most widely used population-level proxy for adiposity. At a group level, a higher BMI is associated with greater risk of type 2 diabetes, heart disease, several cancers, and earlier death, and US public-health data note that roughly 2 in 5 adults meet the threshold for obesity [5]. BMI is a continuous trait, and the differences between people reflect a mix of genetic and environmental influences.
Genetic Basis: BMI is substantially heritable. Twin studies span a wide range - a systematic review of 32 twin studies reported a median heritability of about 73%, with individual estimates from 31% to 90% - and the commonly cited 40-70% figure reflects the lower, adult end of that spread [4]. The trait is highly polygenic. A 2018 GIANT meta-analysis in roughly 700,000 people of European ancestry pinned down 941 near-independent BMI signals across more than 500 genomic regions, yet genome-wide significant variants together explained only about 6% of BMI variation in an independent sample [2]. The strongest common signal sits at FTO (the fat mass and obesity-associated gene): each copy of the risk allele is associated with roughly a 0.39 kg/m² higher BMI - about 1 kg of extra weight for an average-height adult - acting largely through appetite rather than metabolic rate [3]. Rare loss-of-function mutations in MC4R (the melanocortin-4 receptor) disrupt satiety signalling and can cause severe early-onset obesity. Pathway analyses of these loci repeatedly point to the central nervous system - appetite, reward, and energy balance - rather than the body's resting metabolism [1].
Environmental Factors: Heritability describes variation within a population at a point in time; it does not cap how much weight can shift when surroundings change. The rise in obesity prevalence over the past half-century has happened far too quickly for the gene pool to explain it [5], which points to environment doing the heavy lifting. The modern 'obesogenic environment' - abundant calorie-dense and ultra-processed food, largely sedentary days, short or disrupted sleep, and chronic stress - interacts with inherited predisposition to make weight gain easier. Socioeconomic status, the local food environment, access to safe places to be active, and cultural eating patterns all contribute. A useful way to hold both facts together: genes shape how strongly a person responds to these conditions, while the conditions themselves largely set where BMI lands.
The published research behind your score, and the variants it draws on.
83 published scores from 19 studies
The body mass index score combines 83 polygenic scores drawn from 19 published studies.
These traits are influenced by some of the same genes and variants as this one
Content updated August 2026.
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