When you see those drastic transformations where people lose and keep off a ton of weight, they have to get the excess skin removed surgically. So it can “grow” or stretch but doesn’t “shrink”. Does the skin just stretch out a lot as fat grows inside the body?
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Skin has a concept called elasticity. It’s your skin’s ability to be stretched and bounce back into place. Elastin and collagen (proteins) promote the bouncing back. Being overweight not only stretches the skin but can also lead to loss of elastin and collagen if the person is overweight for a lengthy period. This is why you can lose small amounts and not have skin sag, you can also bounce back after drastic weight gain into weight loss, that wouldn’t be healthy in other ways though. But if you are obese for a lengthy amount of time, weight loss will have skin sag because the skin lost the proteins necessary to bounce back. These proteins decrease naturally with age too which leads to sagging skin on elderly people.
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