Calorie Deficit

A calorie deficit occurs when you consume fewer calories than your body burns. It is the fundamental principle behind weight loss: when there is an energy deficit, your body uses its fat reserves to obtain the missing energy.

To create a calorie deficit, you first need to know your TDEE (Total Daily Energy Expenditure) — the calories you burn in a day including your basal metabolism and physical activity. Then, you reduce that amount in a controlled manner.

Deficit Levels

A healthy deficit is generally classified into:

• Conservative (~0.5 lb / 0.25 kg per week): Slow but sustainable loss, ideal for beginners
• Moderate (~1 lb / 0.45 kg per week): The standard recommended, ~1 lb per week
• Aggressive (~1.5 lb / 0.7 kg per week): Faster results, requires monitoring
• Maximum (~2 lb / 0.9 kg per week): Only with medical supervision

Importance of Medical Supervision

Strategies for an Effective Deficit

• Prioritize protein — Consume at least 0.7g/lb of body weight to maintain muscle mass.
• Resistance training — Weight lifting protects your muscle mass during weight loss.
• Gradual progression — Start with a conservative deficit and adjust based on your results.

When to Consider Medical Support

If you have tried calorie deficits without success, or if your BMI is ≥30, prescription weight loss medications can be an effective option. These medications reduce appetite, making the deficit more sustainable.