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Covid-19 Updates »

May 17, 2019
in Medicine

It's confirmed: ultra-processed foods make you fat, but we don't know why

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It's confirmed: ultra-processed foods make you fat, but we don't know why
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tags: foodsoverweight

These researches change the perspective of the problem: at the basis of the overweight caused by these foods there is not the presence of fats, salts and sugars but a mechanism not yet explained.

Gianluca Ricciodi Gianluca Riccio
3 minutes of reading

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In a one-of-a-kind study published in the journal Cell Metabolism a group of researchers has shown that a diet based on ultra-processed foods leads to safe weight gain, as opposed to diets which, despite having the same dosage of fat and sugar, do not include processed foods.

The experiment involved 20 healthy adult subjects divided into two groups: one adopted a diet based on unprocessed foods such as fruits, vegetables and nuts for two weeks, the other had bread, sausages and others in his food plan. processed foods.

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Both diets had the same amount of calories, macronutrients, sugars, sodium and fiber.

"I am surprised by the evidence that emerged in this study," explains Kevin Hall, one of the authors, “Because I thought that by providing the same amount of fat, protein and carbohydrates there would be no appreciable difference between the two diets”.

Kevin Hall and Stephanie Chung, co-authors of the study, with one of the participants

After two weeks of testing, the ultra-processed food group gained an average of 1kg of body weight while absorbing around 500 extra calories each day. Previous studies attributed the weight gain to sugars, fats and salts contained in processed foods, but these researches change the perspective: there is an as yet unexplained mechanism underlying this difference.

The "structural" hypotheses

"The sensory properties or the very density of processed food could lead people to eat it more quickly: this means that our gastrointestinal tract does not have enough time to signal to the brain the feeling of fullness"

The blood samples taken from each group also show other elements: in people who have ingested unprocessed foods there is an increase in the hormone PYY, a natural appetite inhibitor.

Some doubts

The biggest limitation to the very interesting study is in the distinction made between ultra-processed and unprocessed foods: there is no official categorization in all respects. Gunter Kuhnle, a nutrition expert at the University of Reading, believes that the definition of "processed food" has become a generic category used to describe all "toxic" food, when often processing foods is important and necessary for their conservation and their palatability.

“According to the NOVA classification, used by the authors of the study, the cooling and packaging of foods make them already processed. Butter and cheese are therefore "processed" foods. The definition of "ultra processed" is then completely arbitrary "

Gunter Kuhnle, University of Reading

The researchers of this study, however, take these early categorization difficulties into account, and announce that they want to improve the distribution of foods in the diets that will be administered in subsequent studies.

"We need to know what aspects of ultra-processed foods change people's habits and calorie absorption that lead to weight gain," Hall says. "The next study will be carried out with diets reformulated in order to make clearer and more identifiable the components of the foods that could have a greater role in this mechanism".

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The author

Gianluca Riccio, copywriter and journalist - Born in 1975, he is the creative director of an advertising agency, he is affiliated with the Italian Institute for the Future, World Future Society and H +, Network of Italian Transhumanists.

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