According to a recent study, the delay in digestion caused by eating biscuits, cakes, burgers, and sausage rolls cause us to gain weight.
Experts say that junk food changes the brain by reducing our ability to control our appetite.
"It appears that astrocytes (star-shaped cells in the brain) control calorie consumption in the short term," said lead author Dr. Christine Browning, from Penn State University in Pennsylvania, USA.
"The study found that short-term exposure to a high-fat/high-calorie diet had profound effects on astrocytes, affecting the normal signaling system that controls gut appetite," he said.
Over time, astrocytes become desensitized to a high-fat diet, he said.
They said that after 10 to 14 days of eating a high-fat or high-calorie diet, astrocytes fail to respond and appear to lose the brain's ability to consume calories.
According to Dr. Christine Browning, this interferes with signals to the stomach and causes delayed digestion. This research by experts opens the way to anti-obesity drugs that target neurons.
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