Article: Q: IS IT TRUE THAT YOU BURN FAT BETTER WHEN EXERCISING AT A LOWER HEART RATE?

M.M., Boston

No. What counts for losing weight is "the total number of calories burned," said Miriam Nelson, director of the John Hancock Center for Physical Activity and Nutrition at Tufts University's Friedman School of Nutrition Science and Policy. It's "bogus," she added, to think that some type or intensity of exercise will burn fat while others will not.

Dr. George Blackburn, associate director of the Division of Nutrition at Harvard Medical School, emphatically agreed: "There is no such thing as fat-burning exercise as opposed to some other kind."

What is true is that the percentages of fuel burned change during

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