pistachios

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Go nuts

Instead of: Trail mix, pretzels
Try: Pistachios, almonds, walnuts

Looking for a snack? Skip the low-cal snack packs in favor of nuts, which are the metabolism-stoking choice. And if you're worried that nuts are too calorie-rich, you can ease that fear. A review published in The American Journal of Clinical Nutrition looked at the question of why when people add nuts to their diet they don't gain the weight researchers would think. The conclusion? Not only are nuts satiating, but they may also increase your metabolism, possibly thanks to their fat content (though more studies are needed to confirm this link). The unsaturated fats may also help your body turn up its ability to burn fat. Plus, "It doesn't hurt that a portion of the calories in nuts don't get absorbed," says Samantha Cassetty, MS, RD in New York City. As one small study found, your body may not fully digest fats from whole nuts, and they may contain about 20 percent fewer calories than listed.