Metabolic adaptation is the modest slowdown in energy expenditure as you lose weight: a smaller body burns fewer calories, and the body becomes a bit more efficient. It's real but often overstated, and it's managed with patience and muscle, not panic.
- A lighter body burns fewer calories.
- Some extra efficiency adds to the slowdown.
- It's real but often exaggerated.
- Muscle, protein and patience manage it.
What's happening
Lose weight and you need less energy to move and maintain a smaller body; the body also gets slightly more efficient. This is why deficits shrink over time and progress slows — the engine behind many plateaus.
Keeping it in perspective
Adaptation is usually modest, not the dramatic 'starvation mode' sometimes claimed. It slows progress; it doesn't stop it or doom you to regain if you keep sensible habits.
Working with it
Preserve muscle with protein and resistance training, lose weight gradually, and adjust portions modestly as you go. Take diet breaks at maintenance if needed. Patience beats panic.