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One Type of Diet Can Add Years to Your Life: MedlinePlus Health News

One Type of Diet Can Add Years to Your Life: MedlinePlus Health News

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THURSDAY, Nov. 16, 2017 (HealthDay News) — Obese people who follow a low-fat weight-loss plan could tack extra years onto their life, a new review of medical evidence suggests.

Such diets appear to help decrease overall risk of early death by 18 percent in people with obesity, amounting to six fewer deaths for every 1,000 people, researchers concluded.

“Weight loss by cutting calories with diets low in fat — diets which also happened to be low in sugar and refined carbohydrates — appears to reduce premature mortality for people who are obese,” said study co-author Dr. Alison Avenell. She is clinical chair of health services research with the University of Aberdeen in Scotland.

However, the review could not determine whether these diets specifically reduce risk of heart disease or cancer.

Researchers also could not tell if adding exercise to dieting produced any additional benefits.

“Weight-loss diets are certainly better for providing weight loss than exercise alone,” Avenell said. “Exercise helps, especially keeping weight off in the long term, and has many other benefits to health. We just didn’t have enough data to find a difference between studies that did and did not include exercise.”

Obesity plays havoc with the body, increasing the risk of many diseases and risk factors that lead to premature death. These include type 2 diabetes, heart disease, high blood pressure and high cholesterol, Avenell said.

“Every system in the body is affected by obesity,” she said.

Avenell and her team conducted a literature review to see whether dieting helps blunt the impact of obesity.

They gathered data on 54 clinical trials involving more than 30,000 adults in all. The trials dated from 1966 to 2016 and had a minimum follow-up of one year. Although details were sometimes scanty, all but one trial featured weight-loss diets that called for reduced fat intake.

The researchers found high-quality evidence from 34 trials showing that weight-reducing diets decrease the risk of early death for adults with obesity.

But fewer studies specifically tracked deaths from heart problems and cancer, making it difficult for the researchers to determine whether dieting would help stem those specific causes of death.

“Very few of the trials we looked at gave data on cancer outcomes, but there were more data for heart disease outcomes,” Avenell said. “Even so, we probably just didn’t have enough studies reporting these data to examine heart disease and cancer well.”

Cardiologist Dr. Andrew Freeman said that even though this study couldn’t show it, the overall decrease in death risk likely is tied to a decrease in cancer and heart disease risk.

“My guess is somewhere in the overall mortality decrease you will find a decrease in cardiovascular disease and cancer deaths,” said Freeman, who’s with National Jewish Health in Denver.

Freeman, who wasn’t involved in the study, believes that further research will conclude there’s no single magic bullet for dropping excess weight and improving health.

“What will ultimately come out of all of this work is it’s not just one thing. It’s not just weight loss, not just diet, not just stress reduction or social support, but a combination of many things together,” Freeman said. “That’s where the best outcomes are, and it hasn’t been looked at in detail because it’s very hard to capture.”

The new study was published Nov. 14 in the journal BMJ.

SOURCES: Alison Avenell, M.D., clinical chair, health services research, University of Aberdeen, Scotland; Andrew Freeman, M.D., cardiologist, National Jewish Health, Denver, and member, American College of Cardiology’s Prevention of Cardiovascular Diseases Council; Nov. 14, 2017, BMJ

News stories are written and provided by HealthDay and do not reflect federal policy, the views of MedlinePlus, the National Library of Medicine, the National Institutes of Health, or the U.S. Department of Health and Human Services.

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