For eleven days the scale has swung between 184.3 and 186.1 lb (83.6 and 84.4 kg), after six weeks in which the number fell every week. You are sticking to your plan and wondering whether your body has stopped losing. A weight loss plateau exists when your trend weight runs flat or upward for three to four weeks and your daily values scatter as usual. A single flat week, even one of ten days, is water in most cases.
Why one flat week is not a plateau
Two processes overlap on the scale: fat loss, which is slow, and water balance, which shifts within hours. Your body stores carbohydrate as glycogen and binds about three to four parts of water per part of glycogen. A hard leg workout, a salty dinner or a short night moves that water around. The swing can hide several days of fat loss.
An example: your trend sits at 84.2 kg (185.6 lb) on Monday. You have been losing about 0.4 kg (0.9 lb) per week. The weekend brought a barbecue and two training sessions, and the next Monday the trend still reads 84.2 kg. The fat loss carried on, and water cancelled it out on the scale. A week later the trend reads 83.6 kg (184.3 lb), and the flat week looks like a notch in a line that otherwise falls. Why your weight fluctuates daily covers how far daily values swing for reasons like these.
Anyone who reads seven flat days as a plateau often changes the plan before there is a reason to. The result is a deficit that is stricter than necessary for a phase that would have resolved itself, plus frustration over a curve that shows nothing wrong.
How to recognise a real plateau
A real plateau meets several conditions at the same time:
- The trend is flat or slightly rising over three to four weeks, not over seven or ten days.
- You weighed in regularly during that time. With only a few readings a week, any curve looks calmer than reality.
- Your daily values scatter as they always do. A suddenly calmer or more restless picture points to changed weighing conditions.
- Something shifted in daily life: larger portions, more snacks, more restaurant meals, fewer walks.
If only the first point applies, look at water and gaps in your data first, for example weeks with few weigh-ins or a holiday with a different eating rhythm. If all four apply, you have a real plateau.
Why the body slows down
Behind a plateau there is usually arithmetic. The old rule of 3,500 kcal per pound is wrong as a predictor according to Hall and Chow, because energy expenditure falls as weight falls. You can still do the sums: one kilo of body weight corresponds to roughly 7,700 kcal according to Hall 2008.
Suppose you eat 2,000 kcal and burn 2,500. The deficit of 500 kcal gives about 0.45 kg (1 lb) per week. After losing 10 kg (22 lb), your expenditure drops by roughly 150 to 250 kcal, say 200. At the same intake, 300 kcal of deficit remain, or about 0.27 kg (0.6 lb) per week. If larger portions and less movement add 300 kcal over the following weeks, the deficit is zero and the curve lies flat. You did not unlearn anything. The sum shifted.
How to read the question in your trend curve
A single daily value never answers the question. The answer sits in the weekly rate of your trend across several weeks. Trend weight instead of the daily value explains how the trend is built. You read the rate from it: change in trend over four weeks, divided by four.
| Trend over 4 weeks | Weekly rate | Reading |
|---|---|---|
| 84.2 to 82.6 kg (185.6 to 182.1 lb) | 0.4 kg (0.9 lb) | Loss continues, no plateau |
| 84.2 to 83.8 kg (185.6 to 184.7 lb) | 0.1 kg (0.2 lb) | Clearly slower, check portions and movement |
| 84.2 to 84.2 kg (185.6 lb) | 0 kg | Real plateau |
| 84.2 to 84.6 kg (185.6 to 186.5 lb) | plus 0.1 kg (0.2 lb) | Real plateau, slightly rising |
Trendcurve does the arithmetic for you. Under Analysis, the Patterns card (Pro) includes plateau detection: when the rate stays below 0.1 kg per week for several days, it shows "Plateau for X days", with a range and an explanation that fits your goal. This display reacts earlier than the four week rule. Treat it as a prompt to look closer, and decide from the course of the last weeks. The balance over 7, 30 and 90 days (also Pro) additionally shows whether the rate has been falling for a long time or only in one week.
Markers are free: under "Settings & more" and "Experiments and markers" you record when you changed something. If you cut portions three weeks ago, the curve shows whether the change already works or is still too young to judge.
What to do about a real plateau
Do not change several things at once. Start with one week of honest logging of everything you eat, including small items like oil, drinks and leftovers from the plate. The gap between the amount you feel you eat and the amount you eat usually shows itself.
Then raise daily movement before you cut more calories. At a lower body weight you often move less without noticing: shorter walks, more sitting, fewer stairs. That item is the easiest to win back, for example with a walk after dinner.
A diet break is the third option. Two weeks at maintenance level is not a step back. Set a marker so you know later why the curve is flat there. If your goal has changed, switch Trendcurve to Maintain. That is a legitimate decision you can reverse at any time.
Which rate suits your weight at all is covered in How fast should you lose weight?. If your weight stays flat for months despite unchanged habits, if you take medication or if you have symptoms, talk to your doctor. Trendcurve is not a medical device.
Set a marker today, keep weighing on your usual days and judge the trend only once it has stayed flat for four weeks.