I think that the hunger after having eaten a candy bar is due to the high glycemic index of this 'food'.
The more the index is high, the more you will be hungry short time after having eaten.
Have you ever experienced that satiety feeling after a vegetable soup?
It is due to the low glycemic index of vegetables and to the high volume that they occupy in our stomach.
On this assumption is based the suggestion about eating whole wheat food instead of refined one (because the former help us to feel fill for a long time).
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