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Your body needs electrolytes for a variety of reasons, including cellular function, muscle contraction and transmission of nerve impulses. If you want to play your best golf, make sure the right mix of sodium and potassium is in your system, says nutritionist Amanda Carlson-Phillips of Athletes' Performance in Phoenix. Her recommendations:1. SODIUM: The body loses sodium rapidly. (Eight ounces of sweat have 240 milligrams of sodium.) Dehydration, cramping and poor muscle function are often the result of having too little of this electrolyte. Assuming you're eating well and avoiding processed foods loaded with salt (the maximum daily intake should be no more than a teaspoon a day), Carlson-Phillips suggests adding electrolyte mix to a bottle of water. Consume this instead of downing a sports drink, which might include unwanted calories, carbohydrates and sugar.2. POTASSIUM: Most people consume too little of this electrolyte, which optimizes cellular function, regulates sodium and helps prevent weakness and fatigue during a round. Consume at least five grams a day (bananas, tomatoes, carrots, almonds, etc.).