The notion that the more you exercise, the more weight you’ll lose could disappoint you. You would be better off focusing on what you’re eating. That’s the word from a study examining daily energy expenditure of 332 adults in five countries, including the U.S. The participants wore devices that recorded their activity levels for a week, and the researchers used that information to calculate the number of calories each person burned using standard measurements. They found that moderate activity - the equivalent of walking a couple of miles per day - burned about 200 calories more than amounts expended by sedentary people, but that more strenuous activity didn’t add up to more calories burned. The findings suggest that the body adapts itself to the extra effort and burns the same calories more efficiently. "The most physically active people expended the same amount of calories each day as people who were only moderately active," explained study leader Herman Pontzer, a professor at the City University of New York. He emphasized that exercise is good for you and can help with weight loss, but its impact isn’t as great as you may have thought.
My take? Practical experience shows us that exercise won’t always result in significant weight loss, especially for those who take in more calories as they increase physical activity. My own experience is that exercise alone is much less effective at promoting and maintaining weight loss than exercise combined with a positive change in eating habits. Diet is key.