Jackie noticed an increase in appetite after she started weight training. Since she did not change her eating habits, her body fat began to drop. Why did this happen?

Weight training can increase muscle mass, and maintaining more muscle generally raises the energy the body uses, including at rest. That higher energy expenditure can contribute to a decrease in body fat even if Jackie’s eating habits stay the same. Choice D correctly describes this relationship; weight training does not slow metabolism to cause fat loss.

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