March 10, 2012

Laura, Registered Dietitian
Potatoes. People living with diabetes are scared of them. Advocates for healthy school lunches want to ban them. Dieters claim they will make you fat. Bloggers call them “Potato Poison” and blame them for causing diabetes. What’s the deal with potatoes?
Potatoes are a starchy vegetable, which means that they are a high carbohydrate food. They are also high in fiber and vitamin C, and have almost twice as much potassium as a banana! They originated in South America. Peru has been known to grow over 5,000 potato varieties, and still maintains 2,800 varieties today. In the US, the vast majority of potatoes grown are the familiar Russet Burbank potato, which makes our beloved baked potato and French fry.
So, are all potatoes equal? That depends. If you are living with diabetes, about one quarter of a potato, regardless of the type, has about one serving of carbohydrates (15 grams). This means you will really want to watch your serving size, since one large potato contains four servings of carbohydrates, which is about the total number of carbohydrates you want to eat in an entire meal. All potatoes have a similar amount of calories, since they are mostly carbohydrate.
Beyond carbohydrates and calories, we start seeing some differences. Sweet potatoes are loaded with vitamin A, packing almost 700% of the recommended daily value in one medium potato. They also have about twice the vitamin C of Russet Burbank and red potatoes.
Purple and red potatoes are unique in the fact that they are packed with antioxidants. The purple potato is full of the antioxidant, anthocyanin, like most blue/purple foods.
Comparison of nutrition facts for various types of potatoes (1 medium):

The bottom line– enjoy eating a variety of potatoes!
Here are a few tips on how to fit them into a healthy diet:
- Bake, broil, roast, or grill your potatoes.
- Instead of butter and sour cream, try topping your potato with plain yogurt and fresh herbs.
- Be aware of portion sizes—split a baked potato with a friend.
- Save French fries or other forms of fried potatoes for special treats.
- Choose sweet potatoes frequently to boost your vitamin A and C intake. Restaurants are often happy to substitute a sweet potato for white potato.
- Be adventurous—try a new kind of potato. Purple potatoes are great mashed! Fingerling potatoes are great roasted with a little bit of olive oil!
- Eat the skin! Try mashed potatoes with the skin included.
Lachman J, Hamouz K. Orsak M. Red and purple potatoes – a significant antioxidant source in human nutrition. International Food Information Service. 2005; 99 (7): 474–82.
Collyns D. Peru’s potato passion goes global. BBC News. 8 February 2008. Accessed 9 Mar 2012. http://news.bbc.co.uk/2/hi/americas/7231148.stm