A new international study shows that people can improve their health through diet and lifestyle changes even if they do not lose weight.
The research was conducted by Israel’s Ben Gurion University, Harvard University, and Leipzig University. It focused on “weight loss resistant” individuals — those who follow healthy habits but struggle to shed pounds.
Published in the European Journal of Preventive Cardiology, the study challenges the common belief that weight loss is the main sign of a successful diet.
Researchers followed 761 adults aged 18 to 24. All participants adopted healthy diets, received exercise guidance, and had free access to gyms. They did not take supplements or medications.
By the end of the study, about one-third of participants had not lost weight, despite closely following the program. However, these individuals showed clear health improvements. Their “good” HDL cholesterol levels increased, leptin hormone levels dropped, and abdominal fat decreased, as confirmed by MRI scans.
The study also identified 12 genetic markers that may affect a person’s ability to lose weight through lifestyle changes. This finding could help develop personalized diet plans in the future.
Researchers concluded that eating well and exercising can bring important health benefits even without weight loss, such as lowering the risk of heart disease and diabetes.
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