Why does weight
come back
after a diet?
Five reasons that make it hard to keep the result. We sort them out with physician Ekaterina Soroka.
Go to the cardsreasons
to see the whole picture
Internist · family physician · dietitian
In short
Weight comes back after a diet for five main reasons: overly strict restrictions, unchanged eating behavior, overlooked causes of weight gain, the body's adaptation to weight loss, and the absence of a plan for the time after the diet. That is the explanation given by Ekaterina Soroka, an internist, family physician and dietitian and a Health of the Future forum expert. We look at each reason in the cards below.
Why doesn't a diet
work
for long?
First the weight goes, and then it comes back. This familiar scenario is not always about “weak willpower”: the result is shaped at the same time by biological adaptation, eating behavior, environment, sleep, stress and the state of your health.
A strict diet temporarily changes what you eat but can leave these factors unaddressed. Together with Ekaterina Soroka, an internist, family physician, dietitian and expert in anti-aging medicine, we look at what is important to take into account.
Five reasons why weight comes back.
One big picture.
Overly strict restrictions
The body and the mind perceive a constant deficit as a strain: hunger intensifies, fixation on food grows, and impulsive decisions become harder to control.
A diet does not change eating behavior
You can cut out bread, sugar or eating after 6 p.m. for a few weeks. But if a person keeps eating to cope with stress, boredom, anxiety or fatigue, the familiar pattern returns once the diet is over.
The causes of weight gain are overlooked
Weight is affected by sleep, chronic stress, depressive and anxiety symptoms, episodes of binge eating, certain medical conditions and medications. Calorie control alone is sometimes not enough.
The body adapts to weight loss
As weight is lost, energy expenditure may decrease while appetite, by contrast, may increase. What worked perfectly well in the first weeks may later stop giving the same result.
The diet has an end date, but there is no plan for afterward
A working strategy is a system a person can sustain for months and years: nutrition, physical activity, sleep and work on eating behavior. Where necessary, it also includes help from a psychologist and medication prescribed by a doctor.
What helps keep the weight off?
What helps keep weight off is not yet another diet but a system a person can sustain for months and years: nutrition, physical activity, sleep and work on eating behavior, with a psychologist and a doctor where necessary. It is worth starting not with prohibitions but with an assessment of your health and a strategy you will be able to follow for a long time.
You should not introduce strict restrictions abruptly or try to change everything at once. That approach can make you feel worse and raise the risk of a relapse. A sensible starting point is to assess your health and, together with a doctor, choose a strategy you will be able to follow over the long term.
Still have a question?
Let's meet at the forum.
Come and talk to Ekaterina Soroka at the Health of the Future forum on October 15, 2026, in Yekaterinburg. Admission is free; the number of places is limited.
This information is general in nature; an individual strategy for losing and maintaining weight is chosen with a doctor. The article was prepared with the participation of Ekaterina Soroka, internist, family physician and dietitian. Published on September 21, 2026.
