A 42-year-old childhood obesity theory may be wrong
New research challenges the decades-old idea that children experience an “adiposity rebound” when their BMI begins rising around age 6. Although BMI returns to earlier levels, a more reliable measure showed that body fat does not rebound at all. The increase appears to come from growing muscle and lean tissue as children prepare for later growth. Researchers say this normal process has been…
A longstanding theory posited that children's body mass index (BMI) initially declines after infancy, then experiences a rebound and continues to rise throughout childhood. However, recent research suggests this "adiposity rebound" may not be a cause for concern. Professor Andrew Agbaje, a physician and epidemiologist at the University of Eastern Finland, analyzed data from over 2,400 children and found that the rise in BMI is not due to a fat rebound, but rather the normal growth of muscle and other lean tissue.
The theory, introduced in 1984, suggested that some children who rebounded earlier in age might be at a higher risk of obesity later in life. However, Agbaje argues that this association is misleading, as the pattern of BMI increase is a natural part of growth and not a risk factor for later obesity. Clinical trials attempting to modify the timing of the rebound have also failed to show any significant difference in outcomes.
Instead, the data suggests that the adiposity rebound is a normal part of childhood growth, and efforts to prevent or modify it may be addressing a problem that does not exist.
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