Is Drastic Weight Loss Dangerous?

Rapid weight loss creates physical demands on the body. Possible serious risks include: Gallstones, which occur in 12% to 25% of people losing large amounts of weight over several months. Dehydration, which can be avoided by drinking plenty of fluids.

What happens if you lose weight too quickly?

SUMMARY: Losing weight too quickly can lead to problems like gallstones, muscle loss, and extreme fatigue. Experts recommend a moderate weight loss of 1–3 pounds (0.45–1.36 kg) per week, or about 1% of your body weight.

How much weight loss is considered dangerous?

But many doctors agree that a medical evaluation is called for if you lose more than 5 percent of your weight in six months to a year, especially if you're an older adult. For example, a 5 percent weight loss in someone who is 160 pounds (72 kilograms) is 8 pounds (3.6 kilograms).