A healthy and sustainable amount of weight to lose in a week is generally about 0.5 to 1 kilogram (1 to 2 pounds)

. This rate is recommended by multiple health authorities including the NHS, Mayo Clinic, and CDC because it balances effective weight loss with minimizing health risks. Losing more than 1 kilogram (2 pounds) per week over a prolonged period is usually considered excessive and potentially unsafe

. Initial rapid weight loss may occur due to water loss, especially when starting a new diet, but this is not fat loss and tends to stabilize

. Very low-calorie diets (VLCDs) can lead to faster weight loss of about 1.5 to 2 kilograms (3 to 5 pounds) per week but are only recommended under medical supervision for people with obesity and specific health needs

. In summary:

• Aim for 0.5–1 kg (1–2 lbs) per week for safe, sustainable weight loss

• Faster weight loss is possible but often involves medical supervision and is not suitable for most people

• Combining calorie reduction with physical activity improves results and helps maintain muscle mass

• Consult a healthcare professional before starting any aggressive weight loss plan to ensure safety.

This approach helps promote long-term success and reduces the risk of health complications.