It began to have a sharp increase in 1966-67, it peaked at 1967 it leveled off again around 1972- 1973.
Calcium as a nutrient is most commonly associated with the formation and metabolism of bone, calcium metabolism is regulated in large parts by the parathyroid hormone (PTH) vitamin D endocrine system which is characterized by a series of homeostatic feedback loops.
Sources of calcium come from both food and supplements.
Food example- milk, yogurt, cheese etc.
Dietary supplements include- Calcium citrate, Calcium carbonate etc.
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