Many people who lose weight eventually regain some or all of it.
This pattern is often called yo-yo dieting or weight cycling. For years, many people have believed that repeatedly losing and regaining weight is worse for health than staying overweight, with claims that it permanently damages metabolism or causes extra muscle loss.
A new scientific review suggests these fears may be greatly exaggerated. Researchers from the University of Copenhagen and the German Center for Diabetes Research carefully examined decades of research and found little strong evidence that weight cycling itself causes lasting harm.
Their analysis was published in The Lancet Diabetes & Endocrinology.
The researchers reviewed evidence from observational studies, randomized clinical trials and animal experiments.
Together, these studies explored whether repeated weight loss and regain changed body fat, muscle, metabolism or the risk of diseases such as diabetes and heart disease.
After examining the available evidence, the authors concluded that many earlier concerns were not supported when important factors were taken into account.
Ageing, existing health problems and the total amount of excess body fat appeared to explain many of the negative outcomes that had previously been blamed on weight cycling.
The review found no consistent evidence that repeatedly losing weight permanently slows metabolism. Likewise, there was no strong proof that people lose more muscle with each cycle or that weight cycling causes the body to gain more fat than before.
The researchers explained that when people regain weight, they usually return to a body composition similar to where they started rather than ending up in a worse position. While regaining weight removes many of the health benefits achieved during weight loss, this does not mean a person’s health becomes worse than it was before the weight loss attempt.
This difference is important. Losing weight often improves blood sugar, blood pressure and cholesterol levels. If the weight returns, many of those improvements disappear, but current evidence suggests the person usually returns to their previous level of risk instead of developing additional harm because of the weight cycling itself.
The findings are especially relevant now because medicines such as GLP-1 drugs can produce large weight losses. If treatment stops, weight regain is common. The authors argue that this pattern should not automatically be viewed as damaging because periods of lower weight may still provide meaningful health benefits and better quality of life.
The researchers stressed that maintaining weight loss remains the ideal goal because lower body weight is linked with better health. However, they also believe people should not avoid trying to lose weight simply because they fear damaging their metabolism if they regain some of it later.
Review and analysis: This article is a broad scientific review rather than a new clinical trial, so it cannot prove that weight cycling is completely harmless in every situation.
However, it brings together a large body of evidence and challenges a long-standing belief that has often discouraged people from attempting weight loss. The review suggests that excess body fat itself remains the biggest health risk, while repeated weight-loss attempts are far less harmful than commonly believed.
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Source: University of Copenhagen.
