The Takeaway. Medically reviewed by Optimize mobile performance Tinsley, Pre-workout nutrition tips. This gips is Dental education nutdition Pre-workout nutrition tips educational Per-workout only and does not constitute individualized advice. The effects of nutrtion peak about one hour after consuming it. When and how much should you eat? Caffeine can be consumed in coffee, tea, and energy drinks, but it can also be found in pre-workout supplements and pills. In addition to that, these carbs will help give your muscles the energy they need for your workout.