Feeling sluggish? If you need a boost, reach for a snack that’s guaranteed to sustain your energy. Protein-rich treats will keep you going for longer than a quick punch of sugar, and incorporating them into your diet is as simple as grabbing a handful of nuts or seeds, a hard-boiled egg, a scoop of nut butter, or low-fat yogurt. Options like these can be carried in your bag so you won’t be caught without a healthy snack. Men need about 56 grams of protein a day and women need about 46.