Why Your Weight Loss Stopped (and What to Change)

You were losing weight steadily and then it stopped. Nothing changed, you're still doing what worked, and the scale hasn't moved in five weeks. The standard advice — eat less, move more — is usually wrong here, and following it tends to make the next few months harder rather than easier.

A plateau is information. This guide covers what's actually happening and how to work through the causes in the order they're likely.

First: is it actually a plateau?

Body weight fluctuates by one to two kilograms day to day from water, glycogen, sodium, fibre intake and where you are in your menstrual cycle. Two or three weeks of a flat scale is normal noise, not a plateau.

A genuine plateau is four to six weeks with no downward trend in your weekly average. Weigh yourself under the same conditions and compare weekly averages, not individual days. Plenty of "plateaus" disappear entirely once you look at the trend line instead of Tuesday's number.

Why it happens: three things at once

Three real mechanisms compound, and none of them is a failure of willpower:

1. You're smaller. A lighter body burns fewer calories doing everything, including existing. Losing 10 kg can reduce daily energy expenditure by roughly 200–300 calories. The deficit that produced your loss has partly closed on its own.
2. Adaptive thermogenesis. Beyond the arithmetic of a smaller body, metabolic rate drops somewhat further during sustained restriction — the body defends against continued loss.
3. Non-exercise activity falls. This is the largest and least visible one. In a prolonged deficit people fidget less, walk less, take the lift, and sit more — unconsciously. Step counts often drop by thousands per day without any perceived change in behaviour.

Then: the intake drift nobody notices

Alongside physiology, actual intake tends to creep up. This isn't dishonesty — it's measurement decay, and it's near universal:

• Portions expand gradually once weighing stops feeling necessary.
• Cooking oil and dressings get estimated rather than measured. A generous pour of olive oil is 150–200 calories.
• Weekends stop being logged. Two relaxed days can offset five disciplined ones entirely — this is the single most common cause.
• Alcohol. Calorie-dense, frequently unlogged, and it reliably degrades food decisions for the rest of the evening.
• Tastes, bites and leftovers while cooking or clearing plates.

Logging honestly for one week — including the weekend, the oil and the wine — resolves a large share of plateaus without changing anything else.

What to change, in order

Work down this list. Most people don't need to get past step three.

Notice that cutting calories is step seven, not step one. Going lower is the instinctive response and the one most likely to trigger the restrict–binge cycle, further muscle loss and a slower metabolic rate — a worse position from which to start again.

The case for a maintenance break

Deliberately eating at maintenance for one to two weeks feels like giving up. It isn't. It reduces adaptive suppression, restores training quality and psychological slack, and lets you re-enter a deficit with something to give.

Practically: raise intake to your estimated maintenance — mostly with carbohydrate and protein rather than fat — hold it for one to two weeks, then resume. Expect the scale to rise a kilogram or two immediately from glycogen and water; that isn't fat, and it comes back off within days of resuming.

When it's worth investigating

Most plateaus are behavioural and physiological. A few aren't:

• Thyroid. Underactive thyroid slows metabolic rate. Worth a test if you also have fatigue, cold intolerance, dry skin or hair thinning.
• PCOS and insulin resistance, both of which make loss genuinely harder — see the PCOS guide.
• Medications. Some antidepressants, antipsychotics, corticosteroids and hormonal treatments affect weight directly.
• Perimenopause and menopause, where falling oestrogen shifts fat distribution and reduces lean mass — see menopause nutrition.
• Disordered eating. If tracking is driving anxiety, or a plateau feels catastrophic rather than annoying, that's worth addressing before any dietary change. Speak to your GP.

Where to start

Log one honest week including the weekend, check your protein against the protein targets, and look at your step count against what it was three months ago. That's usually the whole answer. Resist cutting calories until you've ruled those three out.