How much weight will I lose by not eating for a week?

Not eating for a week can lead to significant weight loss, primarily due to dehydration and electrolyte imbalances rather than fat loss. During the first few days, you might lose 2.2 to 4.4 pounds per day, largely due to water weight and glycogen depletion2. However, this rapid weight loss is not sustainable and can lead to severe health complications, including muscle breakdown, faintness, dizziness, and other adverse effects2.

It's crucial to note that prolonged fasting is not a healthy or sustainable way to lose weight. Instead, controlled methods like intermittent fasting can be more effective and safer for weight management, as they allow for nutritional intake during eating windows14. If you're considering fasting for weight loss, it's important to consult with a healthcare provider to ensure safety and effectiveness.