176 LIFE PROCESSES OF MAN 



Alcohol is made up of carbon, hydrogen, and oxygen. 

 All proteids contain nitrogen in addition to these three. 

 Because alcohol contains no nitrogen, it cannot be used as 

 a food to build up tissue. 



All serve as 

 fuel to yield 

 energy in the 

 form of heat 

 and muscular 

 power. 



USES OF NUTRIENTS IN THE BODY 



Protein Forms tissue 



e.g., white (albumen) of eggs, 



curd, casein (ka'se-m) of milk, lean 



meat, gluten of wheat, etc. 

 Fats Are stored as fat 



e.g., fat of meat, butter, olive 



oil, oils of corn and wheat, etc. 

 Carbohydrates Are transformed into fat 



e.g., sugar, starch, etc. 

 Mineral matter (ash) Shares in forming bone r 



e.g., phosphates of lime, assists in digestion, etc. 



potash, soda, etc. 



Comparative amount of food required for persons of 

 various ages and conditions, taking as the unit, the amount 

 of food required by a man at moderately active muscular 

 work : 



Man at hard muscular work requires 1.2 the amount of food of a man 

 at moderately active muscular work. 



Man with light muscular work or boy 15-16 years old requires 0.9. 



Man at sedentary occupation, woman at moderately active work, boy 

 13-15, or girl 15-16 years old requires 0.8. 



Woman at light work, boy 12, or girl 13-14 years old requires 0.7. 



Boy 10-11 or girl 10-12 years old requires 0.6. 



Child 6-9 years requires 0.5. 



Child 2-5 years old requires 0.4. 



Child under 2 years old requires 0.3. 



Heat is a form of energy and one of the reasons for 

 taking food is to keep up the supply of this energy. 

 The more work a person does the more energy he uses, 

 but even a resting body uses some energy, 'for the heart 

 beats and the muscles of the chest move. The amount of 



