Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Stay Active and Sit Less: In a prospective cohort of male health professionals, the most physically active men were 19% less likely to develop moderate or worse lower urinary tract symptoms than the least active (HR 0.81, 95% CI 0.74 to 0.89). Men watching 30 or more hours of television a week were 24% more likely to develop them than men watching under an hour, and the two associations held independently of each other and of body mass index. General public guidance is around 150 minutes of moderate activity a week. In that same cohort, activity was not clearly linked to improvement in symptoms men already had, so the benefit looks more like delaying onset than reversing it. Journal of General Internal Medicine (PMC)
Keep Body Weight in Check: Prostate size tracks with body size. In the Baltimore Longitudinal Study of Aging, each 1 kg/m2 higher body mass index corresponded to a 0.41 mL larger prostate, and men with a BMI above 35 had roughly 3.5 times the risk of prostate enlargement compared with men below 25. Diagnosed diabetes, raised fasting glucose and high serum insulin are associated in the same direction, with larger prostates and more BPH surgery. Age still dominates everything else: autopsy series found histological BPH in about 8% of men in their fourth decade of life, 50% in their sixth and 80% in their ninth. Asian Journal of Urology (PMC)
Choose Whole Over Ultra-Processed Foods: Among 77,951 UK Biobank men followed for a median of 10.5 years, with 7,387 new BPH diagnoses, each 10% increase in the share of diet weight coming from ultra-processed food was associated with 4% higher BPH risk (HR 1.04, 95% CI 1.01 to 1.06). Each 10% increase from plant-origin foods overall went the other way (HR 0.91, 95% CI 0.88 to 0.94), though plant foods that were themselves ultra-processed did not carry that benefit. HDL-related metabolites mediated roughly 19% of the ultra-processed association, which points toward lipids and inflammation rather than anything prostate-specific. This is observational, so the direction of effect is not settled. Nutrition Journal (PMC)
Time Your Fluids and Caffeine: Urinary symptoms tend to cluster at particular moments, especially overnight and when a bathroom is hard to reach. The NIDDK self-care list for an enlarged prostate is behavioral: drink fewer liquids before going out or going to bed, limit alcohol and caffeine, stay physically active, and avoid holding urine for long stretches. None of that changes the prostate itself. It changes how much urine arrives and when, which is usually what makes the symptoms disruptive. NIDDK (NIH)
Know Prevention Evidence Is Limited: A systematic review of 110 studies covering diet, fluid intake, caffeine, alcohol and tobacco in relation to lower urinary tract symptoms graded 59% of that literature at level 4, the weakest tier, and concluded the evidence is sparse and mostly observational. Caffeine and tobacco associations were inconsistent. Modest alcohol use was associated with a lower likelihood of a BPH diagnosis, though the same review linked intake above recommended drinking thresholds with worse urinary symptoms. Urinary symptoms also have causes that have nothing to do with the prostate, so symptoms that persist or change are worth describing to a clinician rather than self-managing indefinitely. Journal of Urology (PMC)
How much of this is genetic?
Genetics explains 50% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Twin studies (Partin et al. 1994, ~49% of variance genetic) and SNP-based estimates
Background and further reading
Benign prostatic hyperplasia (BPH) is a non-cancerous enlargement of the prostate gland that develops as men age. The prostate surrounds the urethra, so as tissue in its transition zone grows, it can compress the urethra and produce lower urinary tract symptoms (LUTS) including urinary frequency, urgency, nocturia (waking to urinate), a weak or interrupted stream, straining, and a sensation of incomplete bladder emptying. BPH is extremely common: histological changes are present in roughly half of men in their fifties and the large majority of men by their eighties, though only a fraction have bothersome symptoms. BPH is distinct from prostate cancer and does not progress to it, but the two can coexist.
Genetic Basis: The tendency to develop BPH is partly inherited. Family and twin studies suggest heritability on the order of 40 to 60 percent (a classic twin study attributed about half of the variance to genetic effects), with a stronger familial component in men who develop symptomatic disease at a younger age. Genome-wide association studies have identified multiple common variants associated with BPH and prostate volume, and there is genetic overlap with serum PSA levels and prostate growth. The underlying biology is driven by androgen signaling: testosterone is converted to the more potent dihydrotestosterone (DHT) by the enzyme 5-alpha-reductase, and DHT promotes proliferation of prostate stromal and epithelial cells. Shifts in the balance of androgens and estrogens with age, along with local growth-factor and inflammatory signaling, contribute to the hyperplastic growth.
Lifestyle and Associated Factors: Beyond genetics and age, several modifiable factors are associated with BPH and LUTS. Obesity, central (abdominal) adiposity, type 2 diabetes, and metabolic syndrome are linked to larger prostate volume and more severe symptoms, likely through hormonal and inflammatory pathways. Higher levels of physical activity are consistently associated with a lower likelihood of BPH and LUTS, while a sedentary lifestyle is associated with greater symptom burden. Diet patterns high in red meat and refined carbohydrates have been associated with higher risk, and vegetable-rich diets with lower risk. Because symptoms and prostate size do not always correspond, the impact of these factors is measured largely by symptom burden rather than gland size alone.
The published research behind your score, and the variants it draws on.
3 published scores from 2 studies
The benign prostatic hyperplasia score combines 3 polygenic scores drawn from 2 published studies.
Ng M, Leslie SW, Baradhi KM. Benign Prostatic Hyperplasia. StatPearls (NCBI Bookshelf) (2024)
These traits are influenced by some of the same genes and variants as this one
Prostate Cancer: A common cancer of the prostate gland in men, most often slow-growing.
HbA1c: Glycated hemoglobin, reflecting average blood sugar levels over the past 2-3 months.
Content updated August 2026.
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