MITCHELL: excess amcunt of calciua mre vill be excreted, LISBYs So what is nermal calcium content of the food per day - (oontimed ) you happen to kncy that? MITCHELL: | Ko, but about .45 grams would be the minimal intake to kebp a person (adult) in caleiua equilfbrina, LIBBY: So it%s about 20 percent as a ainimmn efficiency, MITCHELL: Yes, the bulk of calcium is excreted in the feces, This will wary considerably with age. For instance a growing | in this part of the curve will need about 1 1/2 gras asia miniwim intake to keep his growth rate gcing, That is recomzenied intake and that has a margin of safety that mtrition people put in, The bulk of the calciua gets creted in the feces if you have a high calelun dist. If yo get cn a lower calciua dist dcwn to the point where a deal of the calciua is absorbed, then the bulk of the ex] cretion in negative calciua balance will be in the urine,/ LIBBY: Ite still about 80 percent excreted even in the negative balance, That is, you said 450 is a minimal ani you take/is 100, MITCHELL Ys that right? Well, for these people let us say you bed a person takinglin ne calcium at all, a certain ancunt cf caleiua will be exp creted ani that we'll atterpt to reach a alpimal figure apd | Denartmes> /#O