Yo-yo effect: study finds possible health benefits

A recent study suggests that trying to lose weight repeatedly—even if you gain it back—could have lasting benefits on metabolic health. This changes the usual approach to cyclical diets and is relevant now that many people return to eating plans frequently.

Key results and why they matter

Researchers published their findings in the journal BMC Medicineafter analyzing nearly 300 participants in two consecutive randomized trials of 18 months each. Using magnetic resonance imaging, the team detected sustained improvements in abdominal composition and metabolic markers even as body weight recovered between interventions.

In practical terms, participants who repeated the program showed a significant reduction in visceral fat—the most harmful fat around the organs—and improved parameters such as insulin sensitivity and the lipid profile, with estimated changes between 15% and 25% compared to their initial values.

Method and scope of the study

The volunteers participated in interventions based on a Mediterranean-style diet combined with physical activity and were compared with control groups. They were carried out magnetic resonance imaging (MRI) before and after each intervention to measure abdominal fat and other metabolic biomarkers.

The follow-up was extended to 5 and 10 years, which made it possible to observe long-term effects: although many returned to their starting weight before starting the second phase, their metabolic profile and abdominal fat distribution were more favorable than at the beginning of the first trial.

Interpretation: a metabolic “memory”

The authors propose that repeated changes in lifestyle can induce a kind of cardiometabolic memorythat is, persistent modifications in metabolic function that persist despite weight recovery. According to the team, this effect would explain why intermittent weight loss continues to offer clinical benefits over time.

However, the study does not eliminate the risks associated with excessive weight gain or suggest that weight regain is desirable; rather, it indicates that each attempt at improvement can add benefits, even when the “number on the scale” does not reflect all internal changes.

Practical implications

• The reduction of visceral fat It is key: it has a greater impact on cardiometabolic risk than total weight.
• Measuring progress only by kilos can be misleading; Indicators such as insulin and lipids provide a more complete picture.
• Participating in healthy lifestyle programs again may offer cumulative benefits, although weight loss may be less on subsequent attempts.

The study was led by researchers at Ben-Gurion University of the Negev and involved collaboration with teams at Harvard, Leipzig Clinical University, and Tulane School of Public Health. Its design, focused on measurements by MRI and long-term follow-up, provides new evidence on how repeated dietary interventions affect metabolic health.

Ultimately, for those who have experienced cyclical dieting, these results suggest that resuming healthy efforts may have real benefits beyond visible weight; Metabolic health can improve with each attempt, even if the weight comes back on.

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