Hard cardio beats weights for shrinking visceral fat

Visceral adipose tissue, the fat stored deep in the abdomen around the organs, is a prime target for exercise interventions in people with overweight and obesity. But exercise comes in many forms: steady aerobic work, resistance training, high-intensity intervals, and combinations of them. Individual trials rarely compare more than two options head to head, so which type shifts visceral fat most effectively has been hard to pin down. A network approach, which pools many trials and ranks every option against every other, can answer the question more directly than any single study.

The researchers pooled 84 randomised controlled trials covering 4836 participants with overweight or obesity. The exercise categories compared were aerobic exercise of at least moderate intensity, resistance training, aerobic combined with resistance training, and high-intensity interval training. Outcomes included visceral adipose tissue alongside weight, total body fat, BMI, waist circumference and subcutaneous fat. A probability ranking was then used to estimate which intervention was most likely to be the best for each outcome.

All four exercise categories reduced visceral fat. In the rankings, vigorous-intensity aerobic exercise and HIIT had the highest probability of being the best intervention for visceral fat, and also for weight, total body fat, BMI, waist circumference and subcutaneous fat, while resistance training came out least effective. A subgroup analysis added a wrinkle: resistance training improved visceral fat in men and in people with body fat below 40%, but not in women or in those with body fat of 40% or more. All categories improved the other body measures too, with the exception that resistance training did not significantly improve weight.

The finding confirms the broad consensus that regular exercise reduces visceral fat in people with overweight and obesity, and goes further by ranking the options across a large evidence base. The sex and body fat differences in the resistance training result are intriguing and unexplained. Rankings from this kind of pooled comparison indicate probability rather than certainty, so the league table should be read as the most likely order, not a settled one. Whether the advantage of vigorous aerobic work and HIIT holds over longer periods remains an open question.

If deep abdominal fat is your concern, this is a reason to think intensity and cardio matter: vigorous aerobic sessions and interval training topped the table, while lifting alone ranked last for this particular outcome. That does not make resistance training worthless; it reduced visceral fat in some groups, and it serves purposes this analysis did not measure. The takeaway is informational: every exercise category studied helped, and the differences are about which helps most.