The main factor determining differences in energy requirements of individuals of similar gender and weight is the difference in

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Physical activity plays a significant role in the energy requirements of individuals. People with similar gender and weight can have different activity levels which affect their daily energy expenditure. High levels of physical activity lead to higher energy requirements, while a sedentary lifestyle requires fewer calories to maintain body weight. Genetics, body temperature, and height may also have some impact on calorie needs, but these factors are generally more minor compared to the effect of physical activity.

The Main Factor Determining Differences in Energy Requirements of Individuals