Answer to Question 1
Heart Disease Protein itself is not known to contribute to heart disease and mortality, but some of its food sources may do so. Selecting too many animal-derived protein foods, such as fatty red meats, processed meats, and fat-containing milk products, adds a burden of fat kcalories and saturated fat to the diet and crowds out fruits, vegetables, legumes, and whole grains. Consequently, it is not surprising that people who eat substantial amounts of high-fat meatsparticularly processed meats such as lunch meats and hot dogshave higher body weights and a greater risk of obesity, heart disease, and diabetes than those who eat less. As the Nutrition in Practice points out, people who substitute vegetable protein for animal protein lower their risk of dying from heart disease.
Kidney Disease Excretion of the end products of protein metabolism depends, in part, on an adequate fluid intake and healthy kidneys. A high protein intake increases the work of the kidneys but does not appear to damage healthy kidneys or cause kidney disease.10 In people with chronic kidney disease, however, a high-protein diet may accelerate the kidneys' decline. One of the most effective ways to slow the progression of kidney disease is to restrict dietary protein
Answer to Question 2
a
Risks of infectious disease increase in (a) high-density agricultural populations compared to (b) lo
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