Q. What are the nutritional differences between a sweet potato, yam, and white potato? Which is healthier and how often should I include them in my diet?
A. Yams and sweet potatoes look alike, and they have just about the same amount of calories, carbohydrate and fiber. Even though yams have twice the potassium, sweet potatoes rule because they supply the most beta-carotene of all vegetables, while yams have virtually none. Beta-carotene is an antioxidant that fights cell damage and helps reduce the inflammation common after hard workouts. Because they're digested and absorbed much slower than white potatoes, sweet potatoes help ward off diabetes by controlling blood glucose levels. In fact, white potatoes raise blood sugar levels almost as quickly as sugar and spike insulin in a similar manner, making them a great postworkout snack when they're paired with a protein shake. The folate levels in white potatoes come in handy after you train, as folate helps with cell regeneration. However, sweet potatoes are the best with most other meals since you don't want insulin spikes at other times of day. They're also a good source of vitamin E, another potent antioxidant. With the exception of potassium, white potatoes are on a nutritional par with yams.
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