To lose 4 kg in a week, you would need to create a calorie deficit of approximately 5,000 calories per day, which is a very large deficit that can be difficult to achieve through diet and exercise alone. This could lead to feelings of extreme hunger, fatigue, and other negative side effects.
A more sustainable approach to weight loss is to aim for a calorie deficit of 500 to 1000 calories per day, which would result in a weight loss of 0.5 to 1 kg per week. This can be achieved through a combination of healthy eating and regular exercise.
It's important to remember that weight loss is a journey that requires patience, dedication, and a long-term commitment to healthy habits. Consulting with a healthcare professional or a registered dietitian can also be helpful in creating a safe and effective weight loss plan that is tailored to your individual needs and goals.