With that in mind, the Institute of Medicine, the health arm of the National Academy of Sciences, recommended that the U.S. Department of Agriculture stop participants of the federal Women, Infants and Children program, known as WIC, from buying potatoes with federal dollars. The institute also called for the USDA-backed school lunch program to limit use of potatoes.

Under an interim rule, the USDA agreed to bar WIC participants from buying potatoes with their federal dollars. Potatoes are the only vegetable not allowed. Next year, the agency will roll out a final rule on the WIC program, which last year served 9.3 million children and pregnant and breast-feeding women considered at risk for malnutrition.

The WIC program is a supplemental food program, and the determination was made that consumption of white potatoes was already adequate, said Christine Stencel, spokeswoman for the Institute of Medicine.

“The recommendation was made to encourage consumption of other fruits and vegetables,” she said.

I'm curious to see what the theory behind it is. It may be because it's is full of starch which is a factor in obesity.