When you get fat, do you make extra skin? People tjat were fat and got skinny usually have leftover skin. Is that skin they made when they were fat or is it stretched out skin?

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When you get fat, do you make extra skin? People tjat were fat and got skinny usually have leftover skin. Is that skin they made when they were fat or is it stretched out skin?

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Both sorta, it stretches out, and more skin fills in the gaps. But it takes time, and sometimes the skin stretches too far too fast and it leaves behind stretch marks

Your skin is the shape it is because you have a “fabric” or a “web” that covers your body like a human shaped suit. Your skin cells grow on/in this fabric and that’s why you are covered in a skin that seems perfectly shaped for you. The fabric is stretchy and like a t-shirt or dress it will stretch out over time. This fabric can unstretch a little but if it is stretched too far then your skin cells fill it in and it can no longer unstretch. The only way to fix this is to cut out the excess skin.

The reason you get a scar when a deep cut heals is related to this. When you get a deep cut the fabric that shapes your skin is also cut. Since your skin cells only know how to grow on/in this fabric, a cut in the fabric prevents your skin cells from healing together and instead the gap gets filled with a different material called scar tissue. Scar tissue is not made of cells, instead its like a glue that is flexible and can hold skin together. When you go to the doctor and get stitches, a good doctor will try to stitch your skin together as closely as possible to make the gap between the two sides of the fabric line up as close as possible so that as little scar tissue as possible will be needed to stick the two sides together. This is why an untended wound will cover over with a big scar while a properly tended wound can be almost invisible.

Sorta. Or at least it tries to

With gradual/minor weight gain/loss, your body will be able to adapt

With rapid change, it’s a bit different

Rapid weight gain can cause skin to stretch. That’s what stretch marks are.

Rapid weight loss can leave a lotta flab. That’s what a tummy tuck is for; tighten things up.

If you lose weight slowly, the skin can more or less contract as you go. If you lose a lot of weight quickly, you end up with saggy bags of skin that just sort of hangs. It’s (somewhat risky) plastic surgery to remove it.

Best to lose weight slowly. Healthier too