I can provide information based on general knowledge.
The amount of weight a person can lose in a week varies significantly from individual to individual and depends on several factors, including their starting weight, body composition, metabolism, and the approach they take to lose weight. Generally, a safe and sustainable rate of weight loss is considered to be around 1-2 pounds (0.45-0.9 kilograms) per week.
Extreme weight loss in a short period, such as losing a large amount of weight in one week, is not recommended as it can be detrimental to health and lead to various issues like nutrient deficiencies, muscle loss, and other health complications. It's essential to approach weight loss in a gradual and healthy manner, incorporating a balanced diet, regular physical activity, and consulting with healthcare professionals if needed.