Hello there. To understand the math behind weight loss, it helps to look at the basic energy equation. One kilogram of body fat is roughly equivalent to 7,700 calories.
To lose 1 kg in a single week, you would need a total weekly deficit of 7,700 calories, which breaks down to an average daily deficit of about 1,100 calories. Whether you achieve this by burning more through activity or eating less, that is the target number.
Is it realistic for a woman in her 30s? An 1,100-calorie daily deficit is quite steep and can be very difficult to maintain, especially while enjoying rich, traditional comfort foods like pot roast and biscuits. A more sustainable and realistic goal for long-term health is usually a loss of 0.5 kg per week, which requires a manageable daily deficit of about 500 calories.