WASHINGTON -- Eating less and exercising more are equally good at helping take off the pounds, US researchers said yesterday in a study that challenges many of the popular tenets of the multibillion-dollar diet and fitness industry.
Tests on overweight people show that a calorie is just a calorie, whether lost by dieting or by running, they said.
They found there is no way to selectively lose belly fat, for instance, or trim thighs. And their carefully controlled study bolstered evidence that adding muscle mass does not boost metabolism and help dieters take off even more weight.
"It's all about the calories," said Dr. Eric Ravussin of Pennington Biomedical Research Center, part of Louisiana State University in Baton Rouge.
"So long as the energy deficit is the same, body weight, fat weight, and abdominal fat will all decrease in the same way."
Ravussin said the study, published in the Journal of Clinical Endocrinology & Metabolism, is one of the few done under controlled conditions that can actually demonstrate what happens to a human body while dieting and exercising.
Ravussin's team has been testing volunteers for another reason -- to see whether taking in fewer calories helps people live longer. Strict diets have been shown to help animals from worms to dogs live longer, but it takes longer to study monkeys and humans.
They tested 24 people: 12 who ate a calorie-restricted diet and 12 who dieted and also exercised five times a week for six months.
The dieters ate 25 percent less than normal, while the exercisers reduced their calorie intake by 12.5 percent and increased their physical activity to lose an extra 12.5 percent in calories.
Another 10 volunteers acted as controls. All food was provided by the university in carefully measured portions for most of the study.
The volunteers in both groups lost about 10 percent of their body weight, 24 percent of their fat mass, and 27 percent of their abdominal visceral fat. Visceral fat is packed in between the internal organs and is considered the most dangerous type of fat, linked with heart disease and diabetes.
The distribution of the fat on the body was not altered by either approach -- helping prove that there is no such thing as "spot reducing," Ravussin said in a telephone interview.
This suggests that "individuals are genetically programmed for fat storage in a particular pattern and that this programming cannot easily be overcome," he added.
Ravussin has published other studies that also dispute the idea that exercise builds muscle that helps people lose weight.
"If anything, highly trained people are highly efficient, so they burn fewer calories at rest," Ravussin said.