Answer to Question 1
Fiber-rich foods tend to be low in fat and added sugars and therefore prevent weight gain and promote weight loss by delivering less energy per bite. In addition, fibers absorb water from the digestive juices; as they swell, they create feelings of fullness, delay hunger, and reduce food intake. Soluble fibers may be especially useful for appetite control. By whatever mechanism, as populations eat more refined low-fiber foods and concentrated sweets, body fat stores creep up. In contrast, people who eat three or more ounces of whole grain foods each day tend to have lower body and abdominal fatness over time. Commercial weight-loss products often contain bulk-inducing fibers such as methylcellulose, but pure fiber compounds are not advised. High-fiber foods not only add bulk to the diet but are economical, are nutritious, and supply health-promoting phytochemicalsbenef its that no purified fiber preparation can match.
Answer to Question 2
c
Negative feedback control of a regulated variable.
A wastegate is used on the first-generation Duramax diesel to control maximum boost pressure.
Components of Weight Gain during Pregnancy
Control of BP and Blood Flow
Control of Respiration
Control of Homeostasis: Negative Feedback