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Abstract
Continuing increases in world population indicate a critical need for expanded food production. Africa and South America have the greatest potential for increases in cultivated land. Double cropping could increase the present worldwide cropland area of .37 to .62 ha/persons by 2000 A.D. Animal agriculture can utilize several million hectares of marginal land for pasture and forage production. Protein intake is about 90g/day in developing countries. Animals provided nearly 70% of the United States protein intake in 1975, compared to 50% in 1910. Animal feed efficiency decreases as the degree of fatness increases. Direct competition with humans is reduced when animals are foraged or fed by-products rather than grain only. Soybean proteins can be used to a large extent by humans but are deficient in methionine, cystine and vitamin B12. Proper heat treatment enhances their nutritional value. Fiber and phytate content of vegetable proteins must be evaluated in practical nutrition. Vegetable proteins will become increasingly important in the 21st century; however, caution must be used in the modification of diets. "Engineered foods" must be equivalent to the food replaced, both in nutrition and palatability.
Soybean meat analogs and extenders are discussed as potential foods for humans. Overuse of soyproteins in some meat products produces flavor changes that reduce consumer acceptance of extended meat products
1 Presented as the Third Halpin Memorial Lecture at the Univ. of Wisconsin, April 26, 1979.
2 11112 Carriage Place, Ft. Wayne, IN 46825.
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