Calculate the optimal calorie deficit for fat loss based on current weight, goal weight and activity level. Includes time estimate and macro recommendations.
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A caloric deficit occurs when you consume fewer calories than your body expends. It is the only essential requirement for losing body fat, regardless of the type of diet you follow. When your body does not get enough energy from food, it draws on its fat stores (and to a lesser extent, muscle) to cover the gap.
To lose approximately 0.5 kg of body fat, you need a cumulative deficit of around 3,500 kcal. This does not mean you should create the largest deficit possible: an excessive deficit causes muscle mass loss, fatigue, hormonal disruption and a higher likelihood of rebound weight gain.
Current research recommends a moderate, sustainable deficit combined with strength training and adequate protein intake as the most effective strategy for losing fat while preserving muscle mass.
Conservative (10-15%)
~0.25-0.5 kg/week. Ideal for preserving muscle. Best option for athletes and those with little fat to lose.
Moderate (20-25%)
~0.5-0.75 kg/week. A good balance between speed and sustainability. The most recommended option for most people.
Aggressive (30-40%)
~0.75-1+ kg/week. Only advisable under professional supervision, for individuals with a high body fat percentage, and for short periods.
As a general benchmark, a rate of weight loss of 0.5-1% of body weight per week is considered safe and sustainable. For an 80 kg person, this equates to 0.4-0.8 kg per week.