Stop clicking on that 'bait!
But while you're here, I very much enjoyed this Q&A-style article about current knowledge in nutrition: "The Ultimate Conversation on Healthy Eating and Nutrition."
Maybe it's confirmation bias, but I do believe the best diet while building a startup is the one that cuts out all the things that actually _have_ nutrition labels. Also cheat days. You gotta have those.
On a more serious note, most founders I know don't self-care enough. Go work out. Eat healthy. Get more sleep. If you're feeling down, there's no shame in talking to a professional - be it a coach or a therapist. Both will make you a better founder.