What to Eat Before a Workout—and 10 Other Times You Need Energy the Most

During a long day of shopping (for endurance)

What To Eat: Steel-cut oatmeal, egg whites, fruit, and nuts.

Why: Starting off any long day with a good breakfast is key. “Try steel-cut oatmeal for long-acting, low-glycemic carbs, and some egg whites or a protein shake for protein,” suggests David Greuner, MD, a cardiovascular surgeon and director of NYC Surgical Associates. “Adding a fruit in the morning will also give you sustained energy for the day.” Endovascular surgeon at NYC Surgical Associates Christopher Hollingsworth, MD, adds that multiple small meals (versus three large meals) is also key. “A large meal can really slow you down and make you feel fatigued during a long day out running errands. Take along a bag of almonds and snack frequently for quick hits of energy.”  Here are more healthy snacks you don’t have to feel guilty about.