Not an expert, but I’d imagine the feeling you might be thinking of is your blood sugar levels being low. If you have something earlier in the day that digests slowly like a salad with chicken or nuts on it, it would digest slower than something like a bag of potato chips. In the first case, you might eventually eventually get hungry but have ok blood sugar levels, but in the second scenario, you might feel shaky, nauseous, or panicked.
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