The bad fats – especially saturated fat contained in foods including junk food – trigger messages that are sent to the cells of the body, asking them to ignore the inhibitory hormones that regulate appetite, our weight, and we made too eat. So concludes a new U.S. study. This negative effect can last several days, sabotaging our efforts to return to a healthy diet after making us overeat, according to the study.
This study shows for the first time how certain foods can create a vicious circle boulimsie food, pushing us to overeat. The lead author of the study, conducted Medical Center Southwest in Dallas (USA), the doctor Deborah Clegg, said: “Normally our body is prepared to say when we’ve eaten enough, but this does not always happen and when we eat something good. ”
“What we showed is that all the brain chemistry of a person can change in a very short period of time,” she says.
“Our results suggest that when you eat food rich in fat, your brain is affected by fatty acids, and you become resistant to insulin and leptin. Vout Since your brain does not say to stop eating, you end up overeating.
Leptin is a hormone produced in the brain. Leptin suppresses hunger, while insulin is produced by the pancreas and regulates blood sugar. Although the study was conducted on rats and mice, the team of researchers from the doctor Deborah Clegg said that their results have reinforced the usual dietary recommendations to limit intake of saturated fats because they make you eat more and especially overeating.
Animals tested during the study received the same amount of calories in one of the following three types of fat: palmitic acid, monounsaturated fatty acid or unsaturated oleic acid (found in olive oil and seeds Grape among others). The biggest impact on leptin and insulin has been caused by molecules of palmitic acid, which is especially beef, butter, cheese and milk.