Physical education is a unique aspect of education in that it provides the only. instruction for students in the development and maintenance of positive attitudes, essential knowledge and physical skills. The contribution of physical education is to.
1 Kidney disease can cause a build-up of nitrogen waste products in the blood, which can damage nails. 2  Liver disease can damage nails.  Thyroid diseases such as hyperthyroidism or hypothyroidism may cause brittle nails or splitting of the nail bed from the nail plate (onycholysis).
Foods with Calcium or Protein. A lack of calcium can cause the nails to be brittle and dry. Calcium benefits the body most when it is absorbed along with vitamin D, so milk is a great source of calcium. Other calcium sources include yogurt, cheese and kale.