A natural chemical produced by the gut when it breaks down fibre makes us feel full up. Scientists have succeeded in making a (foul-tasting!) powder which can be added to food to help people to eat less and slow down weight gain.
They had to bind the chemical to a natural carbohydrate found in plants to take it safely through the digestive system without being broken down before it could reach the gut and work.
The next post-Christmas fad diet?
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. Being overweight is usually a result of eating when you don't feel hungry. I think.