HOW FOODS MEET BODY NEEDS. 37 



Another use for the charts is in showing what foods can be com- 

 bined to make a complete ration. For a complete ration the sum of 

 the energy from all the foods included should equal 100 per cent, and 

 similarly with protein, calcium, phosphorus, and iron. Although 

 there is no disadvantage and probably considerable advantage if 

 the totals for calcium, phosphorus, and iron are higher than those 

 for energy and protein. The completeness of a ration can be tested 

 by adding together the percentages of the constituents shown on the 

 charts. In classroom or lecture use it may be more effective to fiU 

 in the lines on a skeleton chart as the different foods making up a 

 ration are discussed. Allowance must also be made for bulk and 

 vitamines. As pointed out on page 4, these are necessary elements 

 of the diet although they can not be definitely measured. 



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