Why Calories Don't Count by Giles Yeo

This accessible science book argues that body weight is governed largely by biology—genes, hormones, brain ‘set points’, metabolic adaptation and the microbiome—rather than simple arithmetic of calories in versus calories out, and shows how the modern food environment, especially ultra-processed foods, hijacks appetite and undermines willpower; it reviews the evidence behind dieting failures and proposes practical and policy-level changes to reshape the environment and help people maintain healthier weights.

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