This is a great thread. The answer is a resounding yes!
Some foods do make you sluggish and some foods make you feel fresh and energetic. For me, rice based stuff and lentils makes me energetic and wheat/meat/sucrose/fructose make me lethargic.
Overeating is a big culprit. You don't feel like doing anything when your stomach is full to the point of bursting.
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