Scientists have revealed why there's always room for dessert at the end of a huge meal.
Dr. Nora Volkow, director of the US National Institute on Drug Abuse, says our junk food culture has led to the chemical signals sent by the stomach to say we are full being overrided by the pleasure centres in the brain.
The high volume of sugary foods in our diet has disturbed the balance between the two systems, Dr Volkow said.
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