Inducing ketogenesis whose byproduct is the retention of water and generation of ATP has historically acted as an epiphenomenal method of apoptosis. Survival rates vary but fasting has proven to be an effective method.
I'm a vegetarian and a celiac (no gluten) so I don't eat a lot of processed food. Rice, oatmeal, corn tortillas, black beans, cheese, hemp hearts, flax seeds, chia seeds, Sriracha, coffee w/honey and hazelnut creamer - all that is easily 90%+ of my diet. I also drink a protein drink called OWYN daily.
About once a week I'll have a little to eat in the morning and then I just won't really get hungry again til really late and I'll often just not eat then and go to bed. Intermittent fasting is great. A few times a year I'll go a few days without really eating - there are so many benefits to the process. The primary being autophagy - that I sus is the reason I look so much younger than people my age.
The science of sleep radically disagrees with the next thing I'm about to say.
The process with food and the body is very similar to the process of sleep and the brain.
Occasionally pulling an all nighter playing video games (can't be a stressful all nighter) is actually good for you - it resets some stuff in your head. This can be particularly effective for dealing with certain states of depression or melancholia.