It is not safe or healthy to try to lose 1 kg (2.2 lbs) of fat per day. Crash dieting or extreme weight loss methods can be harmful to your health and lead to nutrient deficiencies, muscle loss, and even rebound weight gain. A safe and sustainable rate of weight loss is about 0.5-1 kg (1-2 lbs) per week, which is about 500-1000 calories per day. Additionally, losing 1 kg of fat per day would require a significant calorie deficit of 7700 calories per day, which would be difficult to achieve through diet and exercise alone, and would most likely result in muscle loss and fatigue. Instead of focusing on losing weight quickly, it's important to focus on making sustainable lifestyle changes that promote healthy weight loss. This includes eating a balanced diet with nutrient-dense foods, regular physical activity, and getting enough sleep and stress management. It's also important to consult with a healthcare professional or a registered dietitian before making any drastic changes to your diet or exercise routine.