if calories equal energy why do we feel more lethargic on high calorie foods like kebabs, fast food, pizza etc rather than more energetic. And why do we feel more energetic on lighter goods like chicken and salads.

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if calories equal energy why do we feel more lethargic on high calorie foods like kebabs, fast food, pizza etc rather than more energetic. And why do we feel more energetic on lighter goods like chicken and salads.

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