F'ROBLEM I. Honj^ to Choose Foods Wisely 



Fig. 193 Expermients teach iimcb about 

 what inight have caused the differences 



ING CO.) 



But to keep on storing fat is useless. And 

 carrying this stored fat about Math you 

 at all times is not only useless; it becomes 

 tiring. Older people should be careful not 

 to permit too much fatty tissue to form. 

 It is important to note that when young 

 people are overweight the cause may not 

 be overeating of fat or carbohydrates. 

 This is discussed in a later unit. You can 

 now plan a day's meals which would pro- 

 vide the correct amounts and kinds of 

 carbohydrates, fats, and proteins. 



Minerals and water in your diet. Min- 

 erals are of many kinds and have many 

 uses in the body. Certain minerals are 

 necessary for assimilation. Some, like cal- 

 cium and phosphorus compounds, are 

 needed for making bones and teeth. Iron 

 compounds are needed for making red 

 blood cells. Sodium, potassium, and cal- 

 cium affect the heartbeat. Magnesium, 

 calcium, and chlorides help indirectly in 

 digestion. 



diet. If the rats are of the same age and sex, 

 in weight and appearance? (general bak- 



FiG. 194 These rats of the saiiie sex were horn 

 in the same litter. At 22 weeks of age one 

 weighed 2\ times as vmch as the other. Their 

 diet differed in ofity one respect. The large rat 

 received more calcium. What conclusions can 

 you draw? (u. s. department of agriculture) 



In any ordinary diet you get enough 

 sodium, potassium, magnesium, and phos- 

 phorus. But it is wise to make sure of 

 obtaining sufficient calcium, iron, and 

 iodine. The table on page 172 shows in 

 which foods you may obtain calcium and 



