When eating fewer calories, it is very easy to develop nutritional deficiencies,particularly if the diet does not rely on a wide variety of foods that provide tracenutrients that are important for life, but whose importance has not been scientifically determined yet. The biochemical machinery of the body is very complex. Some diseases, such as osteoporosis, may be caused by a deficiency of any of the manycomponents required to build bone. Bone consists of a collagen matrix made from protein withcrystals of calcium phosphate and several other trace minerals. Vitamin D is required forbone development. CR diets must contain the appropriate amounts of Vitamin D, calcium, phosphorus, protein, and trace minerals to maintain healthy bones. It is essential to use to verify that your diet meets all the Recommended Dietary Allowance (RDA) for protein,vitamins, minerals, and essential fatty acids. People who for ethical or philosophical convictions do not eat animal products (vegans) may need dietary supplements to avoid vitamin deficiencies.


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