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No one-size-fits-all diet plan exists when it comes to weight loss, according to a new study in the journal of the American Medical Association.
Researchers looked at four dozen previous trials of more than 7,000 overweight and obese adults.
Many participants followed popular name-branded diets, while others followed no diet.
The participants reported their body weight or body mass index.
After six months, those on low-carb diets and low-fat diets lost approximately the same amount of weight which was 18 pounds.
The researchers found those on individually named diets didn't see much of a difference.
People who exercised and had support saw increased weight loss.
But after a year, many people stopped losing weight and gained a couple of pounds back.
The study authors have advice for the millions of Americans who attempt to diet: find one that works for you and stick with it.
They say there is not sufficient evidence to recommend any particular diet.