Comment: Nutritional rickets is highly prevalent in countries such as Mongolia, Tibet and China1 where winter sunlight is reduced and there is no universal vitamin D supplementation. Paradoxically, rickets is also prevalent in developing countries in the tropics and subtropics where sunlight is unlikely to be a limiting factor. Low calcium intakes (including vegetarian diets), prolonged breast feeding, and covering of the skin may all contribute.2,3
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