Since the 1950s, food scientists have measured the nutritional content of food and have seen a tendency for nutrients to decline. The sweet potato actually showed an increase in riboflavin and a decline in phosphorus and calcium, though these results are not statistically different from zero. The larger trend toward decline is statistically significant. To learn more about the decline and what you can do, read our article on nutrient decline in garden crops.
Sweet Potato: Change in Nutrient Data
In the table provided below we present the nutritional content of sweet potato from 1950 and 1999. The 1950 values for sweet potato are adjusted for water content — a sample with more water will bias the results. These nutrient indicators are based on a small number of data points and not one of the apparent individual changes are statistically significant, even so, as a group, they suggest a decline in nutrient content in small garden produce.
Nutrient Change In Sweet Potato
*The 1950 data is adjusted for water content.
Creative Commons License: Share the Knowledge
The figures used to present differences in nutrients in garden produce here are Traditional Foods, including change in sweet potato, can be reposted and redistributed for noncommercial use with a link back to this particular page or to the our page that presents the data project : nutrient decline in garden crops.
The historical measures on the nutrient content of fruits and vegetables has been published and distributed by the U.S. Department of Agriculture. It was also examined by Davis, Epp, and Riordan whose work we describe on this site. We adjusted the 1950 sweet potato nutritional content so that the water content of the 1950 and 1999 samples would be the same, as did Davis, Epp, and Riordan.
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