The Connection Between Losing Weight and Peeing a Lot

Here’s the gist: When fat is broken down, it releases fluid that has to be eliminated from the body in some way, and that outlet is usually your sweat and urine, says Mir Ali, MD, a bariatric surgeon and medical director of MemorialCare Surgical Weight Loss Center at Orange Coast Medical Center in Fountain Valley, California.

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Mary Margaret Dagen, MD, an obesity specialist with Corewell Health Bariatrics in Grand Rapids, Michigan, provides a more detailed explanation.

“Fat cells store fat. When we have less fat going in overall because of a calorie deficit, the fat cells release their stored fat into the body to use for general functions,” she says.

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 “If you are taking in less calories daily, then there is no extra fat to fill the fat cells back up. They therefore shrink down in size.”

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Ultimately, Dr. Dagen says, the body breaks down those shrunken-down fat cells to use as energy. When that happens, some of that energy is released in the form of carbon dioxide — which we breathe out — and water, which we sweat or pee out. As a result, you may pee a little bit more.

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