Potatoes fit into the vegetable section on the food pyramid. More specifically, potatoes belong to the sub-category of starchy vegetables. Other members of the starchy vegetable group are corn, lima beans, water chestnuts and black-eyed peas.
One medium potato is equivalent to 1 cup of starchy vegetables. The recommended weekly intake of starchy vegetables depends on a person's age and sex. For instance, children ages 4 to 8 years old need 3 1/2 cups, women 19 to 30 years of age need 5 cups and men 19 to 30 years of age need 6 cups of starchy vegetables on a weekly basis.