I describe that as a carb hangover. In fact, if you're eating a regular Western diet and feel faint before lunch and sluggish after, you can appreciate to what

I describe that as a carb hangover. In fact, if you're eating a regular Western diet and feel faint before lunch and sluggish after, you can appreciate to what degree you're chasing your blood sugar around. Switching to a diet with more protein and vegetables, and maybe "slow carbs" ala Tim Ferriss, you can even those highs and lows out and not feel them any more.