How do people eat like this? I decided to try trading out my usual salad and water for a nacho special today as an experiment.     Nachos:  ~1100 calories.     24oz (diet) Mt Dew.     Aaaand this feels horrible.  I feel nauseous from gorging on this much food, like I'm trying to carry a bowl of vomit ready to slop over at any mistep.  I have this cloying sweetness in my mouth that wont go away no matter what I do.  I feel winded and sweaty going for a leisurely mile and a half walk when normally I'd only feel /relaxed/ from such trivial exercise, my stomach hurts from being so full, and my teeth feel greasy.  I feel like collapsing at my desk and taking a nap.  I'm just glad I went with diet soda or I'm sure the sugar rush would have me feeling even worse.      How do people do this on a regular basis?  I feel like crap after doing this once and will probably skip dinner and run a few miles to see if it helps me to feel functional again.  I can only imagine how horrible I'd feel doing this daily, or for multiple meals a day (my stomach is roiling just contemplating that).