Is it possible to lose 5 pounds in 1 day if your sick and have diarrhea?

While it's technically possible to lose 5 pounds in a day due to dehydration from diarrhea, this weight loss is primarily water weight and not fat loss. Such rapid weight loss can be harmful and may lead to serious health issues, including electrolyte imbalances. It's crucial to stay hydrated and seek medical attention if diarrhea is severe or persistent.