No fad diet: ‘Good’ body fat burns more calories
Fight fat with fat? The newest obesity theory suggests we may one day be able to do just that.
Just like good and bad cholesterol, there apparently are good and bad types of body fat. Scientists until recently believed this good fat, which spurs the body to burn calories to generate body heat, played an important role in keeping infants warm but by adulthood was mostly gone or inactive.
Now three studies — from researchers in Boston, Finland and the Netherlands — show that some good fat remains in adults, affecting metabolism and potentially offering a target to help people shed pounds.
Brown is good
The good fat is actually brownish, while the more predominant bad fat is white or yellow. Brown fat is stored mostly around the neck and under the collarbone. White fat tends to concentrate around the waistline, where it stores excess energy and releases chemicals that control metabolism and the use of insulin.
All three research groups documented the presence and activity of the brown fat by examining tissue samples from some patients and using high-tech imaging that indicated how much sugar, and therefore calories, the fat burned.
One group from Joslin Diabetes Center, Harvard Medical School and three hospitals in Boston looked at scans done on nearly 2,000 patients to diagnose various health problems. The other two groups scanned small numbers of patients, first at room temperature and then after a couple hours in mild cold, about 60 degrees.
Here’s what the scientists learned about brown fat:
Lean people had far more than overweight and obese people, especially among older folks.
It burns far more calories and generates more body heat when people are in a cooler environment.
Women were more likely to have it than men, and their deposits were larger and more active.