American Medical Association classified obesity a chronic disease, during its annual meeting in Chicago this week.
Before now, it was considered a major public health problem.
Some said changing obesity's classification is the first step in being able to better treat the disease.
Marisa Pruitt, Registered Dietician, Gundersen Health System said the change may encourage insurance companies to increase coverage for treatment.
"Paying for services for something like obesity would be similar to paying for all of your diabetes services," Pruitt said. There's a lot that goes into it and those costs can add us quickly so from a health care stand point I think this is great we can maybe start seeing some insurance coverage for obesity treatment.
Pruitt recommends people struggling with obesity see a dietitian for a consultation to determine the best way to help you.
Click here for information on obesity treatment from Gundersen.
"We believe that raising the level of seriousness by classifying obesity as a disease may encourage third-party payers to increase coverage for treatment and may also encourage greater investment for study," Dr. Patrice Harris, a member of the AMA's board of trustees said.
The decision overrode a recommendation by an AMA committee that had studied the matter for more than a year. While committee members weren't authorized to speak to the media, their final report pointed out that obesity was typically diagnosed using body mass index, a measure that is imprecise and not always associated with poor health outcomes.
For example, someone with a body mass index higher than 30 – the Centers for Disease Control and Prevention's definition of obese – might be perfectly healthy, while someone below that threshold might be sick. Classifying obesity as a disease, the committee argued, might cause confusion because it's difficult to link excess weight to health problems, such as heart disease and type 2 diabetes.
But obesity researcher James O. Hill, executive director of the Anschutz Health and Wellness Center at the University of Colorado, said most professionals who diagnose, treat and research obesity are in agreement that a BMI higher than 30 spells trouble.
"I think it's fair game to argue about what the overweight range of BMIs mean for health because the data is all over the place. But once you're over 30, I think it's pretty clear someone is at risk," Hill said.
Hill said he welcomed the AMA's new classification of obesity.
"We recognize that over a third of the population has a disease. Now we can start getting some standardization for reimbursements and treatments," he said.
Dr. Nikhil Dhurandhar, an obesity researcher at the Pennington Biomedical Research Center in Baton Rouge, La., and vice president of the Obesity Society, said he also believed that the AMA's proclamation was a step in the right direction.
"The recognition of obesity as a disease is an extremely important milestone. Obesity has been a disease. It is now recognized to be so," he said, noting that the society had worked with the AMA on its stance.
Dhurandhar said that while he didn't believe anything the AMA does or says is going to miraculously make obesity disappear, its new position paves the way for more effective diagnosis and treatment.
Dr. Richard Besser, the chief health and medical correspondent for ABC News, said he thought the AMA's declaration was much ado about nothing.
"I think it matters little whether we call obesity a disease, a condition or a disorder. We are already talking about the obesity epidemic. It matters less what we call it than what we do to prevent it," he said.
Besser urged Americans to put more effort into exercising and eating a healthy diet.
"We need to get physical activity back into everyone's lives, starting with our kids. We need to get them moving in school and after school. We need to get them eating healthy foods in appropriate amounts. That is where the conversation should be focused, not on whether this is a disease," he said.
Continuing its message of obesity awareness, the AMA also issued a statement against prolonged sitting and encouraged Americans to try different alternatives to sitting, such as standing desks, treadmill desks and walking meetings.
"Prolonged sitting, particularly in work settings, can cause health problems," Harris said. "Encouraging workplaces to offer employees alternatives to sitting all day will help to create a healthier work force," Harris said.
Medical experts have long recognized that sitting for hours on end is not as benign an activity as it seems. Studies find that after four hours of sitting still, the genes and enzymes regulating the amount of glucose and fat in the body start to shut down so that fat in the blood stream is captured and stored by fat cells all throughout the body, especially around the organs.
ABC's Liz Neporent contributed to the contents of this article.
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