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Sustainable Weight Loss After 40

The mathematics of weight loss are straightforward: a consistent daily calorie deficit drives fat loss. One kilogram of body fat contains approximately 7,700 calories; one pound contains approximately 3,500 calories. A daily deficit of 500 calories therefore produces roughly 0.5kg (1 lb) of fat loss per week under stable conditions.

For men over 40, the priority during fat loss is preserving muscle mass — which requires both adequate protein intake (1.8–2.4g/kg of body weight) and continued resistance training. Men who lose weight through calorie restriction alone without resistance training lose a disproportionate amount of muscle alongside fat, resulting in a slower metabolism and reduced strength that makes weight maintenance harder long-term.