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 grows when it is in tension. When you need a skin graft doctors can put a little balloon under your skin and inflate it over a period of months. Then they cut the extra skin they want, take the balloon out, and sew the skin back together.
This is also how being pregnant works, though shrinking the stomach area back down is difficult. Thus the “mommy tuck makeover” became something doctors can do.
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