Your body adapts to the need
You see, the body is an adaptive system. It will adapt to whatever loads you place on it. So if you are a heavier person and you're carrying around body fat, then your body will adapt by creating stronger muscles to lift your body. It's almost like doing a leg press every time you get up out of the chair. If you weigh 300 lbs you're doing a 300 lb leg press, you see? Now if you were to drop 150 lbs of body fat and end up at 150 lbs, your body wouldn't need the same amount of leg muscle to lift you. It would eliminate those leg muscles through catabolic action.
While it eliminates this muscle mass, your metabolism begins to slow. Remember, it's the lean body mass that's burning calories day in and day out, even when you're doing nothing. If you reduce that muscle mass by allowing it to go away (by not challenging your muscles), then your metabolism is going to slow. A lot of people end up at a place where they've lost the body fat and they're lighter, but it's suddenly so much easier to put on body fat. They don't have the muscle mass they once did, they're not automatically burning calories, and if they overeat just a little bit, they'll start packing on the body fat again.
While it eliminates this muscle mass, your metabolism begins to slow. Remember, it's the lean body mass that's burning calories day in and day out, even when you're doing nothing. If you reduce that muscle mass by allowing it to go away (by not challenging your muscles), then your metabolism is going to slow. A lot of people end up at a place where they've lost the body fat and they're lighter, but it's suddenly so much easier to put on body fat. They don't have the muscle mass they once did, they're not automatically burning calories, and if they overeat just a little bit, they'll start packing on the body fat again.
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