Related Experiment Video
Updated: Aug 2, 2026

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
[Calcium and vitamin D intakes during infancy, childhood and adolescence]
1Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe, Japan.
Abstract:
Adequate intakes of calcium and vitamin D are necessary to prevent vitamin D deficiency or increase of plasma parathyroid hormone (PTH) level caused by vitamin D insufficiency. According to the National Nutrition Survey in Japan, 2001 by Ministry of Health, Labour and Welfare, Japan, the average of calcium and vitamin D intakes have not met their RDA at 1-2 ages, and a low calcium intake was observed during adolescence. It is important to know the adequate intake of vitamin D to compensate the low calcium intake in Japanese children.
Related Concept Videos
Role of Skin in Vitamin D Synthesis
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
Essential Minerals for Bone Health
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Hormones and Bone Tissue
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Skeleton and Calcium Homeostasis
Role of Vitamins in Maintaining Bone Health
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
Vitamins
