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Chapter 25: Problem 13

Which statement is not an example of how fat is beneficial? a. Fat helps absorb lipid-soluble vitamins. b. Fat helps produce lipid-soluble hormones. c. Fat has low energy density. d. Fat makes you feel full faster.

Short Answer

Expert verified
c. Fat has low energy density.

Step by step solution

01

Identify key points of each statement

Review each option to understand the benefits of fat mentioned: (a) Absorption of vitamins, (b) Production of hormones, (c) Energy density, (d) Satiety effect.
02

Understand what fat does

Recognize that fat helps in absorbing lipid-soluble vitamins (a), producing certain hormones (b), and contributing to feelings of fullness (d).
03

Assess energy density of fat

Understand that fat is known for having a high energy density, meaning it contains a lot of calories per gram compared to other macronutrients.
04

Identify the incorrect statement

Notice that saying fat has low energy density contradicts the known characteristic of fat.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Lipid-Soluble Vitamins Absorption
Our body needs dietary fat to absorb certain essential vitamins known as lipid-soluble vitamins. These vitamins include Vitamin A, D, E, and K.
They dissolve in fat rather than water. Therefore, they require the presence of dietary fat to be properly absorbed by the digestive system.
For instance, eating vegetables with a small amount of oil helps in the absorption of Vitamin A found in those vegetables. Without fat, these vitamins would pass through the digestive tract without being utilized.
This emphasizes the importance of fat in a balanced diet to ensure we absorb vital nutrients.
Hormone Production
Fats play a crucial role in hormone production. Hormones act as messengers in the body, regulating various physiological processes such as metabolism, immune function, and reproduction.
Lipids are vital in the synthesis of steroid hormones, including sex hormones like estrogen and testosterone. These hormones are made from cholesterol, which is a type of lipid.
Without adequate fat intake, the body's ability to produce these essential hormones would be compromised.
Ensuring adequate fat in the diet supports the body's hormonal functions and overall health.
Energy Density of Fat
Fat is known for its high energy density. This means that fat provides more calories per gram compared to carbohydrates and proteins.
Each gram of fat provides approximately 9 calories, while carbohydrates and proteins each provide about 4 calories per gram.
This high energy density is beneficial in situations where a high-calorie intake is needed in a small volume of food, such as for endurance athletes or those with high energy needs.
However, it's important to balance fat intake with physical activity levels to prevent excess calorie consumption, which can lead to weight gain.
Satiety and Fat
Fat can contribute to feelings of fullness or satiety, which is beneficial for controlling appetite and managing weight. When we eat fat, it slows down the digestive process, meaning food stays in the stomach longer.
This delayed gastric emptying helps prevent overeating by making us feel full for a longer period. Foods high in fat can also stimulate the release of hormones like cholecystokinin (CCK), which signals the brain to feel satiated.
Incorporating healthy fats into meals can aid in controlling hunger and promoting a more balanced diet.

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Most popular questions from this chapter

Birds have several unique physical differences from other vertebrates, and several pertain to how birds process food. Some differences are obvious, such as the presence of a beak and no teeth, whereas other differences can be observed in their internal features. For example, birds have a monogastric digestive system like most other vertebrates, but their digestive system structure differs from that of most other monogastric vertebrates. Which of the following is true about how birds process food? a. Beak emergence coincided with insect inclusion in the bird diet. b. The gizzard is the primary site of mechanical digestion. c. Birds excrete nitrogenous waste and feces through separate openings. d. Birds digest plant material more slowly than ruminants.

The ruminant digestive system has evolved several differences from the traditional mammalian monogastric digestive system because they consume large amounts of plant material. Which of the following is NOT a component of the ruminant digestive system that has evolved to more efficiently digest plant fibers? a. omasum b. abomasum c. reticulum d. gizzard

Which of the following occurs during the cephalic phase of gastric control? a. Salivation is triggered. b. Food is processed by gastric acids and enzymes. c. Gastrin is produced. d. Digestive secretions are released.

Microvilli greatly increase the efficiency of nutrient uptake in the small intestines. How do the size and shape of microvilli promote this efficiency? a. They have a greater surface area-to-volume ratio than larger cells. The finger-like projection shape provides more surface area over the small intestines from which they absorb nutrients and contains blood vessels so nutrients passing through them can enter the bloodstream readily. b. They have a greater surface area-to-volume ratio than larger cells. The finger-like projection shape is present in the middle of microvilli, which have more surface area over the small intestines from which they absorb nutrients and also contains blood vessels so nutrients can enter the blood easily. c. They have a greater surface area-to-volume ratio than larger cells. The finger-like projections prevent large particles of food from passing through the digestive system and also contain blood vessels so nutrients passed through them can readily enter the bloodstream. d. They have a greater surface area-to-volume ratio than larger cells. The finger-like projections aid in mechanical digestion of food particles and contain blood vessels so nutrients passing through them can enter the bloodstream readily.

Why are some dietary lipids a necessary part of a balanced diet? a. Dietary lipids aid in the absorption of water soluble vitamins, including B and C, which are needed for various bodily functions. b. Dietary lipids aid in the absorption of some minerals, including folic acid, iron, and magnesium, which are needed for various bodily functions. c. Dietary lipids aid in the absorption of vitamins, including A, B, C, D, E, and K, which are needed for various bodily functions d. Dietary lipids aid in the absorption of fat-soluble vitamins, including A, D, E, and K, which are needed for various bodily functions.
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