Yeah this is due to high GI, fast-acting carbs. I've experimented with this heavily with my lunches - it's always anything that is high GI (potato chips, cookie

Yeah this is due to high GI, fast-acting carbs. I've experimented with this heavily with my lunches - it's always anything that is high GI (potato chips, cookies, any sort of sugary food) will cause that "crash" after lunch. That's why I save carbs for post-workout after my evening workout.