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The GDA is calculated from estimates of an average boy or girl of 18 years. On average, 18-year-old boys are taller than 18-year-old girls. Additionally, in the male body a higher percentage of tissue is muscle while girls have a higher percentage of body fat. Muscles need energy, whether you are actively using them or not.

In short, boys need more energy because they have more body volume and because the same amount of body volume burns more energy than girls'.

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Q: Why there is a change in energy needs between 18 year old boy and 18 year old girl?
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