A sweeping study of 304 adults found that while total weight loss was nearly identical across groups, those who lifted weights lost more fat and gained lean muscle while non-exercisers lost over 30% of their weight from muscle tissue.
The resistance training group was the only one to increase fat-free mass, with men gaining about 0.8 kilograms and women gaining about 0.9 kilograms of lean tissue.
Researchers described this as a distinction between high-quality and low-quality weight loss, because losing muscle slows resting metabolism and makes weight regain almost inevitable.
Waist circumference reductions favored strength trainers at roughly 9 centimeters, compared to 8 centimeters for aerobic exercisers and 6 centimeters for the no-exercise group.
The study concludes that preserving muscle, not just losing weight, should be the primary health goal, challenging the mainstream fixation on calorie deficits alone.
A sweeping new study of 304 adults at Tel Aviv University has exposed a troubling reality behind the scale: two people can lose the same number of pounds, but one emerges metabolically stronger while the other sets themselves up for weight regain and long-term health decline. The five-month study, published in January in Frontiers in Endocrinology, followed men and women ages 20 to 74 who all ate a 500-calorie daily deficit. Yet those who lifted weights lost more fat and actually gained lean muscle, while dieters who did no structured exercise saw more than 30% of their weight loss come from muscle tissue.
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