When it comes to weight loss, should you focus on diet or exercise?

Anatoly Tiplyashin/Getty Images/iStockphotoI’m a healthy eater, but I’ve always been sedentary. Last month, I started exercising to help me lose 15 pounds by summer. So far, I’ve lost only two, which is frustrating. Is my goal unreasonable?

First, resistance training can help prevent muscle loss associated with dieting only. Regular exercise also helps reduce stress, which otherwise could lead to overeating. And it builds self-esteem, something that’s important for motivation and success.To lose one pound a week, for example, a 185-pound person would need to run for 40 minutes, power walk for 70 minutes or do one hour of vigorous weightlifting every day.

In addition, healthy eating doesn’t always equate to fewer calories. Eating a larger-than-needed portion of salmon, an extra handful of nuts or too many salad toppings can stall weight loss.Weight-loss success means keeping lost pounds off for the long term. But physiologic changes that occur while losing weight, and persist afterward, make that difficult to do.

It’s hypothesized that the more weight you lose and the faster you lose it, the greater these unfavourable metabolic effects will be.a reality-TV weight-loss competition, found that, six years after the show, participants’ resting metabolic rates were lower than expected based on their body-composition changes.participants lost a dramatic amount of weight in a short time through extreme dieting and exercise. The findings may not translate to more modest weight-loss methods.

The findings also suggested that weight-loss maintainers ate a similar amount of calories as the overweight participants. In other words, these people avoided regaining their lost weight by being physically active, not restricting their calorie intake.study, the researchers didn’t find that successful weight-loss maintainers had a lower-than-expected resting metabolic rate.Your diet plays a bigger role than exercise when it comes to losing weight.

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