Getting plenty of potassium can help preserve your muscle mass as you age, says a new study from the American Journal of Clinical Nutrition.

These foods will help you reach the recommended 4.7 grams daily.

Potato
952 mg per medium potato
Serving suggestion: More than a third of a potato's potassium is in the skin, so don't peel before you bake.

Spinach
839 mg per cup cooked; 167 mg per cup raw
Serving suggestions: Briefly saute spinach with olive oil and garlic; use spinach as a base for hearty salads.

Raisins
340 mg per 1/4 cup
Serving suggestions: Sprinkle onto salads, cereal, couscous, and sandwiches, or stir into the batter when making baked goods.

Banana
269 mg per 1/2 cup
Serving suggestion: Keep a few frozen bananas on hand to use as a nutrient-rich ice alternative in smoothies.

Honeydew
194 mg per 1/2 cup
Serving suggestions: Slurp up the sweet melon as is, or chop a few chunks into homemade salsa.

Tuna
134 mg per 2-ounce serving
Serving suggestion: To keep from draining out those heart-healthy omega-3 fatty acids, select water-packed tuna instead of the oil-packed variety.