Rickets
The most extreme effect of vitamin D deficiency is rickets this is cause by a prolonged deficiency, young children between the ages of 3 – 36 months are most at rick due to the speed at which there bones are growing. It wasn’t until the late 19th century that doctors noticed that vitamin D enriched cod liver oil could prevent and treat rickets in children. In diagnosis of nutritional rickets calcium and vitamin D supplements can correct most bone damage within a few days.