Phosphorus recommended daily allowance

Vitamin D regulates calcium and phosphorus absorption and deposition and serum alkaline phosphatase levels. The recommended daily allowance is 5 /xg, increasing to 10 to 15 /xg in older age.109 Vitamin D3 is synthesized under UVB irradiation in the skin where it is stored and released into the circulation in a complex with the vitamin D binding protein. In liver it is hydroxylated to 25(OH)-cholecalciferol, the hormonal precursor, followed by another hydroxylation step in the... 

Cheese is an important dietary source of several minerals, in particular calcium, phosphorus, and magnesium (Table XV). A 100-g serving of hard cheese provides ca. 800 mg Ca, which represents the Recommended Daily Allowance for most adults (Food and Nutrition Board, 1980). However, acid-coagulated cheeses, e.g.. Cottage, contain considerably lower levels of calcium than rennet-coagulated varieties (Renner, 1987). 

Generally, seaweed contains high ash content indicating appreciable amounts of minerals. Mineral content of seaweed can account for up to 36% of its dry mass and mineral macronutrients include sodium, calcium, magnesium, potassium, chlorine, sulfur, and phosphorus whereas the micronutrients include iodine, iron, zinc, copper, selenium, molybdenum, fluoride, manganese, boron, nickel, and cobalt. Among these minerals, calcium holds 4-7% of dry matter. At 7% calcium, a t) ical daily portion size of seaweed (8 g dry weight) provides 560 mg of calcium which is a considerable amount compared to its recommended daily allowance (800-1000 mg) (Anonymous, 2004). In seaweeds, calcium is available as calcium phosphate, and that is more bioavailable than the form of calcium in milk, which is calcium carbonate. 

It may be seen from Table B-4 that many of the products, when used in the amounts indicated, contribute from 1/4 to 1/2 of the Recommended Daily Allowances (RDAs) of calcium and phosphorus (the RDA for adults for each of these minerals is 800 mg). This contribution is very important because many people may drink coffee, tea, beer, or other nondairy beverages at their meals. Hence, quick breads may make up for some of the lack of dietary calcium. Nevertheless, it pays for the consumer to read the labels on these products, because there is a wide variation in their calcium contents. For example, tartrate baking powders contain no calcium. 

One cup (125 g) of self-rising white wheat flour, which contains monocalcium phosphate as a leavening acid, supplies more than 1/3 of the Recommended Daily Allowances (RDA) for calcium, and more than 1/2 of that for phosphorus. Hence, items baked with this flour may be an important source of these minerals for people who fail to eat sufficient amounts of dairy products. 

A summary of individual mineral functions, deficiency and toxicity symptoms, recommended daily allowance, and sources is given in Table M-25, Mineral Table. (Calcium, phosphorus, sodium, and chlorine are listed in this order, and first, under macrominerals, then the rest of the minerals are listed alphabetically under their respective categories—as macromineral or micromineral.)... 

RECOMMENDED DAILY ALLOWANCE OF PHOSPHORUS. The National Research Council recommended daily dietary allowances, with provision for individual variation, of phosphorus are given in the section on MINERAL(S), Table M-25, Mineral Table. 

Note that the recommended daily allowances for phosphorus range from 300 mg to 1,200 mg. Note, too, that the allowances vary according to age, and that provision is made for added allowances for pregnant and lactating females. 

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