The macronutrients that we consume are broken down through digestion and then absorbed in order to ultimately Metabolism is the set of chemical processes involved in utilizing these nutrients and maintaining life in all living organisms.

The macronutrients that we consume are broken down through digestion and then absorbed in order to ultimately Metabolism is the set of chemical processes involved in utilizing these nutrients and maintaining life in all living organisms.

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter11: Digestion And Nutrition

Section: Chapter Questions

Problem 4SQ

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Concept explainers

Nutrition and diet

We are involved in several daily activities. These actions need a significant quantity of energy. The food we eat provides this energy. Food is necessary for development, repair, and other living activities since it supplies energy. All of these are part of the living practice known as nutrition. Nutrition is the study of nutrients in food, how the body uses them, and the relationship between diet, health, and disease. Nutritionists employ concepts from molecular biology, biochemistry, and genetics to understand how nutrients affect the human body. Nutrition also looks at how people can use their diet to reduce their risk of disease, as well as what happens when they ingest too much or too little of a nutrient and how allergies emerge.

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The macronutrients that we consume are broken down through digestion and then absorbed in order to ultimately
Metabolism is the set of chemical processes involved in utilizing these nutrients and maintaining life in all
living organisms.

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The food label in Figure 11.28 lists the nutrients and other substances in a package of ready-to-eat macaroni and cheese. Based on your reading in this chapter, how would you rate this products healthiness in terms of fats and carbohydrates? Figure 11.28 Food labels are useful health tools. Information on a food label can be used to ensure that you get the nutrients you need without exceeding recommended limits on less healthy substances such as salt, sugar, and trans fats. At present, the USDA is considering major revisions to food labels. The proposed changes include showing realistic serving sizes and sugars added by the manufacturer, and printing the calorie content per serving in larger, bolder type so that it is easier for consumers to make informed choices about purchases of prepared foods. (Left: USDA, US Department of Agriculture; Right: FoodCollection/SuperStock)
The human AMY-1 gene encodes salivary amylase, an enzyme that breaks down starch. The number of copies of this gene varies, and people who have more copies generally make more of the enzyme. In addition, the average number of AMY-1 copies differs among cultural groups. George Perry and his colleagues hypothesized that duplications of the AMY-1 gene would confer a selective advantage in cultures in which starch is a large part of the diet. To test this hypothesis, the scientists compared the number of copies of the AMY-1 gene among members of seven cultural groups that differed in their traditional diets. The Figure shows their results. Starchy tubers are a mainstay of Hadza hunter-gatherers in Africa, whereas fishing sustains Siberias Yakut. Almost 60% of Yakut had fewer than 5 copies of the AMY-1 gene. What percentage of the Hadza had fewer than 5 copies? FIGURENumber of copies of the AMY-1 gene among members of cultures with traditional high-starch or low-starch diets. Source: G. Perry et al. 2007. Diet and the evolution of human amylase gene copy number variation. Nature Genetics 39:12561260.
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Bile has a role in _________ digestion and absorption. a. carbohydrate c. protein b. fat d. amino acid
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