Why did my weight loss stop?

Reviewed 2 November 2026 · How these numbers are calculated

A weight-loss plateau usually isn't your metabolism "shutting down". As you lose weight your body burns less, so the same intake becomes a smaller and smaller deficit. A woman who starts at 85 kg (187 lb) eating 1,500 calories a day begins with a deficit of about 620; a year and 21 kg later it's down to about 300, and her loss has slowed from 0.56 to 0.27 kg a week. Recalculate at your new weight, check your steps and portions, and give changes 3–4 weeks.

Why the same diet slows down

Eating a fixed 1,500 calories: woman, 165 cm, 40, 8,000 steps, starting at 85 kg
After	Weight	Burn	Deficit
Start	85 kg 187 lb	2,120	620
8 weeks	80.7 kg 178 lb	2,050	550
16 weeks	76.9 kg 170 lb	1,990	490
26 weeks	72.7 kg 160 lb	1,930	430
52 weeks	64.2 kg 142 lb	1,800	300
104 weeks	54.1 kg 119 lb	1,640	140

Weight and maintenance recalculated every week with the Deficitly engine.

Nothing is wrong here (it's why the 3,500-calorie rule overestimates long-term loss): she keeps losing, just more slowly, and would level off close to the weight where 1,500 calories is her maintenance. To keep losing at the same pace, she'd lower her intake a little or move more every few kilos. Plan your next step with the calorie deficit calculator.

Other common causes

You move less without noticing. Dieting often lowers daily movement: fewer steps, less fidgeting. Check your phone's step count against when you started. More on NEAT, the calories from everyday movement.
Portions creep up. After a few weeks, measuring gets looser and extras sneak back. A week of weighing food again usually shows it.
Water hides fat loss. More salt, more carbs, a new training routine or your menstrual cycle can mask a week or two of loss. Look at the trend, not single days: see why your weight fluctuates.
Exercise calories are counted twice. See should you eat back exercise calories?

Is metabolic adaptation real?

Partly. On top of the drop that comes from weighing less, studies find the body can lower its burn a little further during a long diet, and people tend to move less. For most people the extra effect is modest (tens to a little over a hundred calories a day), not the "starvation mode" that stops fat loss completely. It's one more reason to recalculate every few kilos rather than keep the same target for months.

How to get going again

Recalculate your maintenance at your current weight in the maintenance calorie calculator.
Check your steps and add a few thousand if they've dropped.
Tighten tracking for two weeks: weigh food, count oils and drinks.
Lower intake by 100–200 calories if the trend stays flat for 3–4 weeks, never below 1,200 (women) or 1,500 (men).
Consider a break. A week or two at maintenance (how to get there: reverse dieting) can make a long diet easier to keep up; one trial in men with obesity found that alternating two-week diet and maintenance blocks lost more fat than dieting straight through.

If you've never lost weight on your current plan, that's a different problem: see calorie deficit but not losing weight.

Sources

Byrne NM, Sainsbury A, King NA, et al. Intermittent energy restriction improves weight loss efficiency in obese men: the MATADOR study. Int J Obes 2018;42(2):129–138.
Hall KD, Kahan S. Maintenance of lost weight and long-term management of obesity. Med Clin North Am 2018;102(1):183–197.