An ounce of cashews has 157 calories, a gram of fiber and almost 9 grams of carbohydrates. You can get an energy boost as the carbohydrates in cashews convert into glucose. Magnesium helps regulate your blood pressure, clots the blood and strengthens bones. An ounce of cashews provides you with 83 milligrams of recommended daily intake of 310 milligrams of magnesium. Another nutrient in cashews is phosphorus, which provides energy and helps strengthen your teeth and skeletal system.