Vegetarian Diets 'Twice As Effective' For Weight Loss Than Eating Meat

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Switching to a vegetarian diet could have a whole host of health benefits, including weight loss, new research suggests.

People who go vegetarian not only lose weight more effectively than those on carnivorous low-calorie diets, but also improve their metabolism by reducing muscle fat, a new study has found.

Losing muscle fat improves glucose and metabolism so this finding is particularly important for people with metabolic syndrome - the medical term for a combination of diabetes, high blood pressure and obesity - the researchers said.

Lead author Dr Hana Kahleová, director of clinical research at the Physicians Committee for Responsible Medicine in Washington DC, also said the finding could have a significant impact on Type 2 diabetes.

More than 70 people with Type 2 diabetes were randomly assigned to follow either a vegetarian diet or a conventional anti-diabetic diet throughout the study.

The vegetarian diet was primarily vegan, consisting of vegetables, grains, legumes, fruits and nuts, with animal products limited to a maximum of one portion of low-fat yoghurt per day; the conventional diabetic diet followed the official recommendations of the European Association for the Study of Diabetes (EASD).

Both diets contained the same amount of calories per day.

The vegetarian diet was found to be almost twice as effective in reducing body weight, resulting in an average loss of 6.2kg compared to 3.2kg for the conventional diet.

The team then studied fat-storage tissue in the subjects’ thighs to see how the two different diets had affected subcutaneous, subfascial and intramuscular fat (that is, fat under the skin, on the surface of muscles and inside muscles).

They found that both diets caused a similar reduction in subcutaneous fat. However, subfascial fat was only reduced in response to the vegetarian diet, and intramuscular fat was more greatly reduced by the vegetarian diet.

This is important as increased subfascial fat in patients with Type 2 diabetes has been associated with insulin resistance, so reducing it could have a beneficial effect on glucose metabolism. In addition, reducing intramuscular fat could help improve muscular strength and mobility, particularly in older people with diabetes.

Dr Kahleová said: “Vegetarian diets proved to be the most effective diets for weight loss. However, we also showed that a vegetarian diet is much more effective at reducing muscle fat, thus improving metabolism.

“This finding is important for people who are trying to lose weight, including those suffering from metabolic syndrome and/or Type 2 diabetes. But it is also relevant to anyone who takes their weight management seriously and wants to stay lean and healthy.”

The research is published in full in the Journal of the American College of Nutrition.

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