I used to wake up at 0430, do a workout at home (push-ups, squats, abs, jumping jacks, mountain climbers, etc) for 30 minutes (hundreds of push-ups and squats, etc). Then take a shower. Then breakfast: water, 4 eggs, steak, turkey scallops, half a liter of milk (well, café au lait), fruit).

I'd go out and feel I could slay dragons and bite the moon, and feel that way throughout the whole day. My classmates would get hungry and drowsy by 1100/1130 (they'd drink chocolate milk and eat some treats at 1000), then completely sleepy after eating pizza or sandwitches (I wouldn't get lunch because the food sucked and I still had energy). By 1400, everyone's empty and trying to eat biscuits or something. By 1600, people were dead. I still had a lot of energy. I hadn't eaten anything after breakfast, only drank water.

I would then go home, buy next morning's food (steak, scallops, etc) with the money I saved from not having a disgusting fast food lunch.

I'm considering going back to that regimen. I felt strong and sharp, and working out at home right before taking a shower removed friction as I didn't have to go out, and I did my push-ups and squats right in the bathroom.