 If I'm lucky enough to feel like I can eat the whole time, I'm shooting for like 100 calories every half hour. And then I build in at those checkpoints where I'm trying to eat a meal that's between 500 and 700 calories. Now, you'll go through periods where you just can't eat because your body's so over it. And when you've been up for days, that fatigue also creates a certain degree of nausea. So some of it is you just try to shove it in while you can, and other times you just can't.