
What's special about the potato is that it's got a heck of a lot of potassium and B6. Potassium is good for lowering blood pressure & keeping your muscles happy and cramp-free. B6 is needed to help the metabolism of protein and your red blood cells. In a plain, medium potato (~160 kcalories), you'll get 12% of your folate, 12% of your niacin, 27% of your B6 and 26% of your potassium for the day.
To use the potato in a healthy way, have a small or medium one as your starch for the meal - meaning have it instead of rice, pasta, bread, etc. You can bake, roast, or microwave it (make sure to poke holes with a fork in it first). Then add some steamed veggies or a salad to your plate. Also, make sure you have some protein - you might like black beans with a tablespoon of salsa.