Result: Fewer calories can mean fewer calories burned—not the best equation.“Think of a preworkout snack as fueling, not filling,” says fitness expert Myatt Murphy, CSCS. “Aim for 100 to 200 calories, just enough to give you enough energy for exercise. Too much food, and your stomach will be working out at the same time to digest it all.”
Thirty minutes before exercise is the way to pace this. If you’re an early bird, a preworkout snack is essential—there’s no fuel in the tank. If you exercise mid-afternoon, you might need less.
What to eat: The best preworkout snacks provide a mix of carbs and protein—a banana and a handful of nuts or a slice of whole-grain bread with peanut butter.