By Frances Sizer, Ellie Whitney
Perfect for either non-majors and mixed-majors, foodstuff: ideas AND CONTROVERSIES presents functional purposes and obtainable motives to dispel universal misconceptions approximately food and empower readers to make lasting habit alterations.
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Extra resources for Cengage Advantage Books: Nutrition: Concepts and Controversies
The Science of Nutrition Copyright 2010 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. /Time Life Pictures/ Getty Images Nutrition knowledge is of little value if it only helps people to make As on tests. The value comes when people use it to improve their diets. To act on knowledge, people must change their behaviors, and while this may sound simple enough, behavior change often takes substantial effort. The Process of Change Psychologists describe six stages of behavior change, offered in Table 1-9.
In science, a single finding almost never makes a crucial difference to our knowledge as a whole, but like each individual frame in a movie, it contributes a little to the big picture. Many such frames are needed to tell the whole story. K E Y P OIN T News media often sensationalize single study ﬁndings, and are not always trustworthy sources of nutrition information. National Nutrition Research As you study nutrition, you are likely to hear of findings based on two ongoing national scientific research projects.
In the digestive tract, the stomach and intestine are dynamic, living organs, changing constantly in response to the foods they receive—even to just the sight, aroma, and taste of food. When a person is fed through a vein, the digestive organs, like unused muscles, weaken and grow smaller. Lack of digestive tract stimulation may even weaken the body’s defenses against certain infections, such as infections of the respiratory tract. Medical wisdom now dictates that a person should be fed through a vein for as short a time as possible and that real food taken by mouth should be reintroduced as early as possible.