QUESTIONS 



1 What are the different functions that foods perform in the body? 



2 What functions do all nutrients have in common? 



3 What substances are sometimes deficient in a diet which furnishes plenty 

 of energy-yielding material? 



4 What elements, sometimes lacking in soils, so modify the food content of 

 plants as to limit the growth of animals which feed upon them? 



5 What are the special functions in animal bodies of such minerals as 

 iodine, calcium, phosphorus and iron? 



6 What known vitamins are essential to the normal development of or- 

 ganisms? 



7 What are the sources of all vitamins? 



.8 How can each of us be sure that he gets an adequate supply of the various 

 regulative substances which he needs? 



9 Why do so many of the vitamins have anti-names? 



10 What are some of the specific dangers that we now face in our use of the 

 various vitamins? 



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