Light will cause the formation of solanine on the skin of the potato. Though not likely to cause serious harm, green skinned potatoes can taste bitter and may result in temporary digestive discomfort. When confronted by green skin on a potato, simply peel it away. Keep as much of the rest of the skin as possible. For this is where most of the vitamins reside.
Potatoes are one of the most nutritious staple crops discovered by man.
With milk in the diet, it can be a sustaining and healthful source of energy, vitamins and minerals both in times of want and in times of plenty.