The Battle of Low Carb vs. Low Fat

When it comes to the question of which diet to try, low carb and low fat tend to always be in question. Since we associate losing fat with losing weight, most people steer toward a “low fat diet.” Today, I want to tell you the facts on why a low fat diet doesn’t actually beat a low carb diet.

An analysis of 53 studies, involving 67,000 dieters found those who cut back on fat were two and a half pounds heavier after a year than those who embraced a “low carb” approach.

For decades, there has been debate over the merits of a low fat diet, which was endorsed as the best route to weight loss in the 1970s.

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Now major research, published in the Lancet Diabetes & Endocrinology, backs a low carbohydrate approach as a more effective diet.

The study by Brigham and Women’s Hospital and the Harvard T.H. Chan School of Public Health looked at all previous studies from clinical trials that compared the effect of low-fat diets versus other approaches, at least one year later.

Debate about the effectiveness of low-fat diets has raged since the 1970s .

It analyzed data from 53 studies with 68,128 participants that were designed to measure the difference in weight change between two groups. Those that included dietary supplements or meal replacement drinks were excluded.

On average, participants across all groups were six pounds lighter, one year later. Compared with low-fat diets, participants in low-carbohydrate weight loss interventions were about two and a half pounds lighter.

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Low fat diets were still better than a “usual diet” when participants did not change their eating habits at all, scientists said.

Dr. Deirdre Tobias at Bingham’s Division of Preventive Medicine said: “Despite the pervasive dogma that one needs to cut fat from their diet in order to lose weight, the existing scientific evidence does not support low-fat diets over other dietary interventions for long-term weight loss.”

“In fact, we did not find evidence that is particularly supportive of any specific proportion of calories from fat for meaningful long-term weight loss.”

The study found low carbohydrate diets were the most successful.

Carbohydrate diets have been found to be more effective than a low fat, but doctors said any diet which reduced portion size and focused on a healthy, balanced range of fresh and unprocessed foods could form an effective route to weight loss.

low_carb_diets_vs._low_fat_dietsDr Tobias said: “We need to look beyond the ratios of calories from fat, carbs, and protein to a discussion of healthy eating patterns, whole foods, and portion sizes.

“Finding new ways to improve diet adherence for the long-term and preventing weight gain in the first place, are important strategies for maintaining a healthy weight.”

Professor of Nutrition and Epidemiology Frank Hu at Harvard said: “Current evidence indicates that clinically meaningful weight loss can be achieved with a variety of dietary approaches.

“The key is to improve long-term compliance and cardio metabolic health.”

Experts say, the findings aren’t a huge surprise as most people find it easier to cut down on carbs rather than fat.

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Tom Sanders, Professor Emeritus of Nutrition and Dietetics, King’s College London, said the findings were not surprising because dieters find it easier to reduce bread, potatoes and rice than to cut back on fats.

He said the key message from the research is that overall calorie intake determined the extent of weight loss, however it was achieved. “In order to control body weight, it still remains sensible advice to eat less (restrict portion size) and avoid consuming excess amounts of fat and sugar, especially fatty meat, deep fried foods, cakes and biscuits, and sugar-sweetened beverages,” he said.

 

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