When you get more mature (a much better term than “aging”), your metabolism begins to decrease. So if your diet and exercise look the same in your 30s as they did in your 20s, you will likely begin to gain weight. This happens a little more drastically as you enter perimenopause, usually around your mid-40s. With the decreasing levels of estrogen in perimenopause, you begin to lose muscle mass, and muscle has a much higher metabolism than fat. When menopause officially arrives (diagnosed as no period for a year), weight gain begins to happen disproportionally in the belly.
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