Almonds
Almonds are a great snack, as they contain important nutrients, like magnesium and B vitamins, that help convert food to energy. “Research shows that people with low magnesium levels tend to tire more quickly during exercise due to magnesium’s role in energy metabolism,” explains Rachel Berman, RD, CDN, author of Boosting Your Metabolism for Dummies. Insufficient B vitamins can lead to fatigue, irritability, and poor concentration.