Diarrhea is usually caused by bacterial infections or stress and lasts several days. It can become dangerous when it lasts for weeks or more because it encourages water loss in the body. People with diarrhea can lose a lot of weight if they've been sick for a while, but they're losing mostly water weight.

Can diarrhea cause weightloss?

What Are the Side Effects of Very Low-Calorie Diets? People on a very low-calorie diet for 4 to 16 weeks report minor side effects such as fatigue, constipation, nausea, and diarrhea. These conditions usually improve within a few weeks and rarely prevent people from completing the program.

How much weight do you lose after diarrhea?

You can lose weight from pooping, but it's very, very slight. “Most stool weighs about 100 grams or 0.25 pounds. This can vary based on a person's size and bathroom frequency. That said, poop is made up of about 75% water, so going to the bathroom gives off a little bit of water weight,” says Natalie Rizzo, MS, RD.