How Sweet is a Sweet Potato? Pretty Sweet!


How sweet is a sweet potato

Sweet potatoes are a super food that I have only recently come to appreciate. When preparing my lecture on heart disease epidemiology for our new eCornell course, I found reports of several traditional cultures known for avoiding heart disease that subsist largely on this delicious tuber. In fact, a 1978 paper[1] cited a dietary survey finding that sweet potatoes supplied about 90% of total calorie intake in the traditional subsistence culture of the Papua New Guinea highlanders. 90%! Sinnett and Whyte write, “Indeed, non-tuberous vegetables accounted for less than 5% of the food consumed, while the intake of meat was negligible.” There was no evidence of malnutrition from this diet and no evidence for hypertensive heart disease.

Here are some facts to chew on. If HALF of your diet was solely baked sweet potatoes with no salt, you would get all the nutrients in the table. To top it off: you get all this in a package with a lower glycemic index than white potatoes and many grains[2].

Nutrients in 1000 calories of sweet potatoes (about 10)[3]

Percentage of daily requirements (2000kcal diet)*

* Nutrient amounts calculated from USDA, reference 3, using the average daily requirements listed on


  1. Sinnett P, Whyte M. Lifestyle, health and disease: a comparison between Papua New Guinea and Australia. Med J Aust 1978;1:1-5.
  2. Willcox DC, Willcox BJ, Todoriki H, Suzuki M. The Okinawan diet: health implications of a low-calorie, nutrient-dense, antioxidant-rich dietary pattern low in glycemic load. Journal of the American College of Nutrition 2009;28 Suppl:500S-16S.
  3. USDA National Nutrient Database for Standard Reference, Release 26. In: U.S. Department of Agriculture, Agricultural Research Service; 2014.

Thomas M. Campbell, MD is medical director of the T. Colin Campbell Center for Nutrition Studies, co-author of The China Study and author of The China Study Solution. He is co-founder and clinical director of the groundbreaking UR Program for Nutrition in Medicine. Their next 7 Day Finger Lakes Immersion at the beautiful Woodcliff Hotel and Spa will start July 23rd in Rochester, NY.
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