short term: anything with glucose or caffeine long term: varied but balanced diet (diversified portfolio strategy), the body likely takes care of all the messy

short term: anything with glucose or caffeine long term: varied but balanced diet (diversified portfolio strategy), the body likely takes care of all the messy details Many others here mention sleep and exercise. Hydration should also be considered. I would strongly be in favor is someone suggested a causal link between quality of life and brain functioning. Just look at how long it takes you to die without {air, water, food, sleep, mobility, social interaction} and weigh their importance accordingly.