Too many carbohydrates or too much fat? Opinions as to which parts of our diets are likely to cause obesity are split. A recent study takes a closer look at the effects of diet on weight and health. Does a diet that is too rich in fats or too rich in carbs lead to obesity? Earlier this year, Medical News Today reported on a study that pitted the potential benefits of the low-carb diet against those of the low-fat one.
Which type of diet would be best for shedding excess weight.
Both have pros and cons; some people may benefit more from laying off the fats, whereas others may see better results by sticking to a low-carb dietary plan.
Both carbs (which are a primary source of glucose, or simple sugar) and fats have been blamed for increasing a person’s likelihood of facing obesity, and studies keep debating these points, so the argument is far from settled.
Recently, the view that an excessive carb intake may be the main dietary cause of obesity has had more traction, though some researchers have questioned this.
In a paper now published in the journal Cell Metabolism, researchers from two institutions — the Institute of Genetics and Developmental Biology at the Chinese Academy of Sciences in Beijing and the University of Aberdeen in the United Kingdom — have once more turned the cards, suggesting that we should look once more to fatty foods.
Sugar intake had no impact on weight
In what they think is the largest study of its kind to date, lead researcher Prof. John Speakman and the team worked with mice to test the effects of three macronutrients – carbohydrates, fats, and protein — on body fat accumulation.
The scientists turned to the murine model because, as they explain, asking human participants to follow one type of diet and evaluating them for very long periods of time is extremely tricky. But looking at rodents which have similar metabolic mechanisms could offer crucial clues and workable evidence.
The scientists found that only an excessive intake of fats increased adiposity (body fat content) in mice, while carbohydrates including up to 30 percent of calories derived from sucrose had no impact. Moreover, a combined fatty and sugary diet did not increase body fat more than a fatty diet did on its own. As for protein intake, the research team says that there was no evidence that it affected the intake of other macronutrients or the amount of body fat.
And why does the intake of fat lead to obesity? The researchers believe that fats “appeal” to the brain’s reward system, stimulating a craving for an excessive amount of calories, which then determines weight gain.
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