Physical activity helps in maintaining a healthy weight primarily because it increases the amount of energy your body uses. Engaging in regular physical activity burns calories during the exercise itself and can also elevate your metabolism for a period afterward, contributing to a higher overall energy expenditure.
To address the other options:
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It lowers the basal metabolic rate of the body. This statement is incorrect. Regular physical activity tends to maintain or even increase the basal metabolic rate (BMR), which is the amount of energy your body uses at rest.
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It raises cholesterol levels in the blood. While some types of cholesterol can be beneficial (like HDL cholesterol), physical activity is generally associated with improving cholesterol profiles by lowering LDL (bad cholesterol) and raising HDL (good cholesterol).
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It decreases endorphin levels in the brain. This is also incorrect. Physical activity typically increases endorphin levels, which can improve mood and reduce feelings of depression or anxiety.
In summary, physical activity is fundamental in maintaining a healthy weight primarily by increasing energy expenditure, alongside its numerous other health benefits.