1 86 ^ How a Co7nplex Aimnal Uses Food unit iv 



5. Suppose that in the three meals in one day you ate 9 pieces of 60 

 per cent whole wheat bread, 5 average pats of butter, 2 sweet potatoes, 

 4 strips of bacon, a portion of rice and 2 bananas. How many Calories 

 would this supply? Explain why you would not recommend this diet. 



6. id) Name five foods which your physician might tell you to cut 

 out of your diet if you had to reduce your weight. {Cazitioii: No one 

 should attempt to change his \\'eight except under a physician's guid- 

 ance.) {b) Consult your family and friends for other "rules" for losing; 

 weight. By reasoning and consulting your tables see whether you can 

 find any scientific basis for their statements. 



7. B^' consulting your text, including the food table, make a table in 

 your notebook as follows: In the first column list vertically calcium, 

 iron, phosphorus, iodine, sodium, potassium, and magnesium; in the 

 second column next to each mineral state how it is used; in a third 

 column state which foods contain the mineral in large amounts. 



8. Using the chart, page 172, or a more complete food table, list in a 

 vertical column the foods available to you that provide the largest 

 amounts of each of these vitamins: thiamin, niacin, ascorbic acid, vitamin 

 x\, and vitamin D. You should then learn this list by heart. 



9. Answer the following: {a) When a baby's diet consists only of 

 pasteurized milk, what food should be added to the diet? Why? [b) Ex- 

 plain why factory canned vegetables are presumed to be better for you 

 than those cooked by an inexperienced cook. 



10. There are fads in diet as in everything else. By talking to your 

 friends, see how many of these you can learn about. Discuss each one in 

 class, in order to discover, if you can, whether there is any scientific 

 basis for it. In some cases it will be possible for you to test the truth of 

 a statement by experiment. 



1 1 . Study the advertisements of foods in cars, magazines, etc. Copy 

 them exactly and bring your copy to class for discussion. To what 

 extent are these advertisements scientific? To what extent can you trust 

 them? What information should you get about these advertised foods? 



Further Activities in Biology 



1. As you know, the diets of various peoples difi^er. Make a critical 

 report on the diets of several national or religious groups, like the Eski- 

 mos, Arabs, Jews, Germans, Yankees, etc. 



2. If your school has no charts showing the percentage composition of 

 common foods, a group might make some. Draw the outline of common 

 foods such as a rib roast, a fish, glass of milk, carrot, etc. By consulting 

 the table show the proportion of protein, fat, carbohydrate, mineral, and 

 water (including waste) in each food. Use difi^erent colors to indicate 

 each food substance. 



3. A few of you working together can determine the efi^ect of the lack 

 of vitamins upon certain animals. Report the results of \()ur work to 



