(...) by only fueling your body with shit, you're also fueling your brain with shit. If you improve your diet, you will improve you work, and in the end, your startup. You'll sleep better, be better rested, and use your time more effectively when you're awake.
Brenden Mulligan proposes a healthy, cheap, basic recipe for cash and time-strapped startups. With a bit of creativity there are many ways to cook healthy and cheap, and eating healthy food (and exercising) certainly will make a big difference to your long-term productivity.