By Katherine Beals, Ph.D., R.D., F.A.C.S.M.
I am Dr. Katherine Beals, R.D., and I have served as the nutrition consultant to the United States Potato Board for almost three years now. In this capacity I direct the basic research program and monitor nutrition issues that are related, directly or indirectly to potatoes. One of the most controversial nutritional issues involving potatoes is their relationship with diabetes. Potatoes have been frequently (and perhaps unjustly) accused of raising blood glucose levels, exacerbating or even causing diabetes, and thus are recommended to be limited or even removed from the diets of those suffering from or at risk for diabetes. However, a recent study published in the American Journal of Epidemiology found that potato consumption was not associated with an increased risk of developing type 2 diabetes.

Specifically, researchers from the University of Melbourne and the Cancer Council, Victoria investigated the association between a variety of dietary patterns and type 2 diabetes in a 4-year prospective study of 36,787 adults. The results indicated that a dietary pattern characterized by meats and fatty foods was associated with increased diabetes risk while a dietary pattern characterized by a variety of salad and cooked vegetables, including potatoes cooked in healthful ways, was associated with a decreased risk. Interestingly, when vegetables as a group (excluding potatoes) were examined independently the association with decreased diabetes risk disappeared.
Tufts University Research Shows Calories More Important than Glycemic Load
Another common nutrition misconception that continues to plague potatoes is that they are fattening. This stems from the notion that they are high in calories, high on the glycemic index and leave you feeling unsatisfied (i.e., not satiating). In fact, a medium potato (5.3 oz), with skin, has 110 calories, no fat, no sodium, and no cholesterol. Moreover, researchers from the Jean Mayer U.S. Department of Agriculture Human Nutrition Research Center on Aging (USDA HNRCA) at Tufts University recently published evidence suggesting that when it comes to weight loss the glycemic load of the diet doesn’t matter as long as calories are reduced and fiber intakes are sufficiently high. In this study, 34 overweight, but otherwise healthy, men and women achieved and maintained similar weight and body fat losses after one year, whether they were on a low-glycemic-load or a high-glycemic-load diet.
Potatoes Fill You Up, Not Out
And, far from leaving you feeling hungry and unsatisfied, potatoes have actually been shown in research studies to be one of the most satiating foods around. In a study published in 1995 in the American Journal of Clinical Nutrition Australian researchers examined the satiety value of 240 calorie portions of 38 different foods representing all the basic food groups. Subjects consumed the foods in random order and rated them based on the degree of fullness they provided. Fruits and vegetables were at the top of the satiety index (SI) list of foods. In fact, the highest SI score was produced by potatoes, which was more than three times the SI of white bread!
Potatoes definitely fit within a nutrient dense diet. They are a good source of potassium, provide almost ½ your daily requirement for vitamin C and are a good source of B vitamins (particularly vitamin B6). You can see the values right on the FDA nutrition facts label. One of the things I love most about them is their versatility (i.e., they can be prepared in so many different ways) and they provide a great accompaniment to many other foods, particularly vegetables. In fact, my favorite potato recipe is a baked potato topped with broccoli and melted cheese.
Check back soon to learn more about potato nutrition. I’ll be posting information regularly. If you have a potato-related nutrition question for me, please contact me.