Researchers have identified a targeted way to combat one of aging's most dangerous metabolic shifts: the accumulation of visceral fat deep in the abdomen. A new study shows that testosterone gel combined with exercise can selectively reduce this harmful fat type in older women recovering from hip fractures, offering a path to better health outcomes in a vulnerable population.
The distinction between fat types matters enormously for aging bodies. Subcutaneous fat, which sits beneath the skin, is relatively benign and actually necessary for health. Visceral fat is the culprit. It embeds itself around internal organs and has been firmly linked to diabetes, heart disease, and other serious conditions. As people age, their bodies naturally shift fat storage from safer subcutaneous regions into the visceral compartment, a metabolic trap that traditional weight loss approaches have failed to address.
"As men and women age, there's an unhealthy redistribution of fat from the more innocuous regions into the visceral compartment," says Jacob Earp, an assistant professor of kinesiology at the University of Connecticut. Sex hormones, particularly testosterone, drive this redistribution. The problem intensifies after major injuries like hip fractures, which immobilize older adults and accelerate visceral fat accumulation.
Conventional diet-and-exercise interventions typically reduce overall body weight but lack precision. They strip away muscle along with fat, a dangerous trade-off for older adults who depend on muscle mass to maintain independence and prevent falls. Earp and his team designed a clinical trial to test whether supplemental testosterone could guide the body to shed visceral fat specifically while preserving muscle.
The study tracked 66 women over 65 recovering from hip fractures. One group received a topical testosterone gel alongside a structured exercise program, while the control group did exercise alone. Both groups had their body composition measured at the start and again six months later using DXA scans.
The results published in Obesity Pillars revealed a sharp divergence. Overall body fat remained stable in both groups, but the distribution shifted dramatically. Women on testosterone gel experienced a selective reduction in visceral fat. The control group, by contrast, saw visceral fat increase, the typical pattern during injury recovery.
"If you have injury and just generally as we age, we expect an increase in visceral fat," Earp says. "This really bucked that trend and caused selective reduction of fat in that visceral compartment." Hip fractures are particularly devastating for older women, occurring nearly three times more frequently than in men and ranking among the leading causes of lost independence in this age group.
The implications extend beyond hip fracture recovery. If testosterone gel can steer aging bodies away from dangerous visceral accumulation while preserving muscle, it could reshape how doctors approach post-injury rehabilitation and the broader challenge of aging with metabolic health intact. For women facing the long, difficult recovery from hip fractures, any intervention that improves long-term outcomes could meaningfully restore quality of life.
Author Jessica Williams: "This study shows hormone therapy isn't just about testosterone replacement for symptom relief, it's a precision tool for metabolic control that traditional weight loss completely misses."
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