ATLANTA (CBS Atlanta) – Exercise will not cure the obesity epidemic, three researchers say in a new study.

“The public health messaging around diet and exercise, and their relationship to the epidemics of type 2 diabetes and obesity, has been corrupted by vested interests,” Dr. Aseem Malhotra, an honorary consultant cardiologist at Frimley Park Hospital in the United Kingdom and science director of the advocacy group Action on Sugar, and his colleagues, wrote in their study. “Physical activity does not promote weight loss.”

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Other experts disagree with these findings.

“There is a difference between physical activity and exercise training,” Gordon Fisher, an assistant professor of nutrition at the University of Alabama at Birmingham, told LiveScience. “While this may seem like a minute point, it is critical in discussions about whether physical activity or exercise are effective in helping people lose weight.”

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“Supervised exercise training can help people lose weight, but most people don’t engage in enough physical activity to promote weight loss,” Fisher added.

Fisher did agree with some parts of Malhotra’s study. He agrees that poor diet has played a great role in adding to the obesity epidemic.

The Centers for Disease Control and Prevention report that there has been a dramatic increase in obesity in the United States in the last 20 years and the rates still remain high. More than 33 percent of adults in this country and approximately 20 percent of children between ages 2 and 19 are obese.

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The study was published in the British Journal of Sports Medicine.