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Diet and Exercise Work Equally Well to Protect Heart Health

Which works best to improve the cardiovascular health of those who are overweight—dieting, exercise, or a combination of both? A Saint Louis University study finds it doesn't matter which strategy you choose; it's the resulting weight loss that's the protective secret sauce.

"For men and women with excess body weight, modest weight loss provides powerful protection against cardiovascular disease, regardless of whether weight loss is achieved by using exercise, a healthy low-calorie diet, or both," says Edward Weiss, PhD, an associate professor of nutrition and dietetics at Saint Louis University and the lead author of the article.

His findings were published in The American Journal of Clinical Nutrition.

For the research, Weiss and his team divided 52 overweight, middle-aged men and women into three groups—those who dieted, exercised, or did both—and charged them with losing about 7% of their body weight during a 12- to 14-week period. Those who exclusively dieted or exercised were told to decrease their food intake by 20% or increase their activity levels by 20%. Those who did both were told to eat 10% less and move 10% more.

The researchers analyzed how the changes affected indicators of cardiovascular health, such as blood pressure, heart rate, and other markers for heart disease and stroke, such as high LDL cholesterol levels.

They found the three strategies were equally effective in improving cardiovascular health, and were expected to reduce lifetime risk of developing cardiovascular disease from 46% to 36%.

While dieting and exercising was no better than dieting or exercising alone, as Weiss sees it, his research doesn't give people who have lost weight to improve their heart health license to eat high-calorie junk food or have a sedentary lifestyle. He advocates a combination of healthful eating and exercise as his preferred roadmap to heart health.

"Because our previous research and that of others indicates that exercise and diet each provide their own unique health benefits beyond those that were evaluated in the current study, it is important to recognize that both diet and exercise are important for health and longevity," Weiss says.

"While our study did not find additive benefits of calorie restriction and exercise on traditional risk factors for cardiovascular disease, much of the actual risk of developing cardiovascular disease cannot be accounted for by traditional risk factors. Therefore, our findings don't preclude the possibility that dieting and exercise have additive effects for reducing the likelihood of developing cardiovascular disease. Furthermore, an inactive lifestyle itself is a risk factor for cardiovascular disease, although the physiologic mechanisms for this effect are unknown," Weiss says.

— Source: Saint Louis University Medical Center