There are lots of good reasons to exercise that have nothing to do with weight loss. Now, science has found yet another one: It turns out that a regular exercise habit can make your fat tissue healthier. And that, in turn, keeps you healthier.
To find out how exercise impacts fat tissue, recruited 32 adults with obesity. Half of them were consistent long-term exercisers. They鈥檇 been doing aerobic exercise like jogging or biking regularly at least four times a week 鈥� for at least two years. The other half of the study group was composed of non-exercisers, but they were otherwise similar to those in the first group in many ways.
鈥淥n appearance they looked very similar. They had the same amount of body fat. They carried their body fat in the same manner. They were the same weight,鈥� says , a professor of movement science in the University of Michigan鈥檚 School of Kinesiology, who . The subjects were also matched for age and biological sex.
But when the researchers took samples of the subjects鈥� belly fat tissue from just underneath their skin 鈥� known as subcutaneous fat, the kind of fat you can pinch 鈥� they found stark differences in the regular exercisers.
鈥淲e found that their fat tissue had more blood vessels there, the tissue itself was less rigid. We also found there was less inflammation going on in their fat tissue,鈥� says Cheehoon Ahn, the study鈥檚 first author. He conducted the research, which was published in the journal Nature Metabolism, as part of his doctoral dissertation while at the University of Michigan.
Exercisers also had more beneficial proteins in their fat tissue. Ahn says all of those are signs that their subcutaneous fat tissue was much healthier. By contrast, the belly fat tissue from the non-exercisers did not show any of these characteristics.
And there was another important difference. The fat tissue taken from the regular exercisers had a greater capacity to expand and store fat just underneath the skin. Horowitz says that while it may seem counterintuitive, having fat tissue that can expand is actually a good thing.
鈥淧eople might think, 鈥業 don鈥檛 want my fat cells to expand,鈥� but if they don鈥檛 expand, then that fat is going to go somewhere 鈥� and it鈥檚 going to go to bad places like the liver and the heart鈥� and other organs, Horowitz says.
This kind of fat is known as visceral fat, and having too much of it can raise the risk of serious health issues such as diabetes and heart disease. The changes seen in the exercisers鈥� fat tissue may protect them from accumulating this more dangerous kind of fat, says Ahn, who is now a postdoctoral researcher at the AdventHealth Translational Research Institute in Orlando, Florida.
鈥淵ou know, not all fat is created equal, and it does turn out that location, location, location does actually make a difference鈥� in how fat tissue affects overall health, says , director of the Touchstone Diabetes Center at the University of Texas Southwestern Medical Center in Dallas.
Scherer, who was not involved in the study, is a longtime researcher in the role that fat plays in metabolic disease. He says the fat tissue from the exercisers had all the hallmarks of metabolic health. 鈥淚t鈥檚 a nice study, a brilliant study,鈥� he says. 鈥淭hey show very nicely that exercise really is a good thing.鈥�
And that is good news for all of us, because as Horowitz notes, 鈥淎lmost everyone gains weight as we age, even regular exercisers.鈥�
But Horowitz says if we live a physically active lifestyle, it鈥檚 going to help us store that excess fat in a healthier, safer way. It鈥檚 one more reminder that there are many benefits to regular exercise, regardless of how it affects the number on the scale.
This story was edited by Jane Greenhalgh.
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