How effective is exercise for weight loss? An evidence-based overview of calorie deficit, NEAT and the afterburn effect.
Weight loss only works through a calorie deficit – you must consume less energy than you expend. Exercise is a tool, not a cure-all.
Studies show: nutrition alone accounts for about 70–80% of weight loss success. Exercise supplements the process by increasing calorie expenditure and improving body composition.
Golden rule: A moderate deficit of 300–500 kcal per day leads to healthy weight loss of 0.3–0.5 kg per week.
NEAT (Non-Exercise Activity Thermogenesis) accounts for 15–30% of your daily calorie expenditure – and is often completely overlooked. NEAT includes everything you do outside of exercise:
Practical tip: 10,000 steps per day can burn 300–500 kcal – often more than an hour in the gym. Increase your NEAT before focusing on intense training.
The afterburn effect (EPOC – Excess Post-Exercise Oxygen Consumption) describes increased calorie expenditure after intense training. But how significant is it really?
The afterburn effect exists but is much smaller than often claimed. It alone is not enough for weight loss – the overall balance decides.