For athletes, focus is often treated like a mindset. Lock in, stay present. Be ready for the next play.  But concentration doesn’t exist separately from the body. The brain needs energy, and what an athlete eats and drinks can help support the ability to think, react, and make decisions when the pressure is on. That is especially obvious in goalkeeping. A goalkeeper can go 20 or 30 minutes without touching the ball and then have a split second to decide whether to come off th...