All types of peas are good sources of vitamin A, vitamin C, thiamin, iron, and phosphorus. One cup of shelled peas has 125 calories, and one cup of edible-pod peas has 65 calories. Only about 5 percent of all green peas grown come to the market fresh. Frozen peas retain their color, flavor, and nutrients better than cannedpeas, and are lower in sodium. Snow peas are lower in protein since their seeds are very small; however they provide twice the calcium and slightly more iron than shelled peas.