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Calorie deficit

A calorie deficit occurs when you consume fewer calories than your body burns, forcing it to use stored fat for energy — the fundamental mechanism of weight loss.

To lose weight, you need to use more energy than you take in from food. This is called a calorie deficit. Your body then taps into fat stores for energy. The size of the deficit determines how fast you lose weight, but it must be done safely under medical supervision.

A calorie deficit of 500–750 kcal per day produces a weight loss of approximately 0.5–0.75 kg per week. However, metabolic adaptation reduces the effective deficit over time. Medical weight management programmes account for this by adjusting intake and incorporating strategies to preserve lean mass.

Understanding calorie deficit helps set realistic expectations. Dr Joseph Wang designs individualised plans that create a safe, sustainable deficit while preserving muscle and metabolic health.

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Medical Disclaimer

This library is for general education and does not replace individual assessment by a qualified healthcare professional. Always consult a doctor for medical advice, diagnosis, or treatment.

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