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Liver The organ people only think about when a blood test comes back odd. Two of its commonest numbers are partly inherited, which is why a raise… Alcohol and the flush One of the few places where a single variant is visible in the mirror. Exercise and muscle The "sprinter gene" is the most oversold result in consumer genetics. Menopause The one reproductive event with a date attached, and the date is partly inherited. What follows from that is smaller than the internet suggests. Allergies Allergy runs in families and rose too fast for genes to explain. Both of those are true, and holding them together is the whole subject. Brain and memory What actually changes in a brain over a lifetime, and which of it is written down in advance. Longevity and ageing The supplement industry's favourite word, and what the data supports. Learning and focus Whether the difficulty of sitting down to study is partly inherited — a question with real, and repeatedly overstated, research behind it. Sport and performance Talent tests sold to parents, and what the research behind them actually supports. Running and endurance Running clubs, first marathons, and a watch telling you your VO2max.