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Chapter 7: Problem 1

(LO 7.1) Which of the following vitamins are classified as fat-soluble? a. vitamins \(\mathrm{B}\) and \(\mathrm{D}\) C. vitamins \(\mathrm{B}, \mathrm{E}, \mathrm{D},\) and \(\mathrm{C}\) b. vitamins \(\mathrm{A}, \mathrm{D}, \mathrm{E},\) and \(\mathrm{K}\) d. vitamins \(\mathrm{B}\) and \(\mathrm{C}\)

Short Answer

Expert verified
b is the correct answer - vitamins A, D, E, and K are fat-soluble.

Step by step solution

01

Understand Fat-Soluble Vitamins

Fat-soluble vitamins are those that dissolve in fats and are stored in the body's fatty tissue and liver. They include vitamins A, D, E, and K.
02

Evaluate Answer Choice a

Analyze choice a, which includes vitamins B and D. Vitamin B is water-soluble, and vitamin D is fat-soluble.
03

Evaluate Answer Choice b

Analyze choice b, which includes vitamins A, D, E, and K. All these vitamins are categorized as fat-soluble.
04

Evaluate Answer Choice c

Analyze choice c, which includes vitamins B, E, D, and C. Vitamin B and C are water-soluble, while vitamins E and D are fat-soluble.
05

Evaluate Answer Choice d

Analyze choice d, which includes vitamins B and C. Both vitamins are water-soluble.
06

Identify the Correct Answer

The solution involves identifying the option where all listed vitamins are fat-soluble. After evaluating all choices, choice b contains all four fat-soluble vitamins: A, D, E, and K.

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Key Concepts

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

Vitamin Classification
Vitamins are essential nutrients that our body needs in small amounts to function properly. They are classified into two main groups based on their solubility: water-soluble and fat-soluble vitamins. This classification helps determine how vitamins are absorbed, transported, and stored in the body.
  • Water-soluble vitamins: These include the B vitamins and vitamin C. They dissolve in water and are not stored in large amounts in the body. Excess amounts are often excreted through urine, necessitating a regular dietary intake.
  • Fat-soluble vitamins: These include vitamins A, D, E, and K. They are absorbed along with dietary fats and can be stored in body tissues for longer periods.
Understanding these classifications is crucial for maintaining a balanced diet and ensuring that all vitamin requirements are met.
Nutrient Solubility
Nutrient solubility is an important factor in how vitamins are absorbed and utilized in the body. It refers to the ability of vitamins to dissolve in either water or fat, which affects their storage and function.
For fat-soluble vitamins, their absorption occurs with the help of dietary fats. They are absorbed through the intestinal tract with the aid of lipids. This means that consuming these vitamins with a source of fat helps enhance their absorption.
  • Storage and Transportation: After absorption, fat-soluble vitamins are transported through the lymphatic system and eventually stored in the liver and fatty tissues.
  • Stability: Fat-soluble vitamins tend to be more stable than their water-soluble counterparts. They are less susceptible to being lost during cooking or food storage.
Despite their stability, it's important to consume the right balance because they can accumulate to toxic levels if taken excessively.
Vitamin Storage
The storage of vitamins is largely influenced by their solubility. Fat-soluble vitamins can be stored in the body's fatty tissues and liver, unlike water-soluble vitamins that need frequent replenishment.
Fat-soluble vitamins take advantage of the body's natural ability to store fat. This characteristic means they are not needed daily if a person has stocked up through a nutrient-rich diet.
  • Short-term Storage: Vitamins such as A and E are stored in liver and adipose tissues and can be utilized when dietary intake is insufficient.
  • Risk of Toxicity: Because they are stored in the body and not excreted quickly, there's a potential risk of vitamin toxicity, especially with vitamins A and D.
Having storage capability is beneficial for maintaining the body's needs without immediate reliance on dietary intake but underscores the need for balanced consumption.
Vitamins A, D, E, K
Vitamins A, D, E, and K are the major fat-soluble vitamins, each playing a unique role in maintaining health.
  • Vitamin A: Essential for vision, skin health, and immune function. Found in foods like carrots, spinach, and sweet potatoes.
  • Vitamin D: Important for bone health, it helps the body absorb calcium. Sunlight exposure and foods like fortified milk and fish are sources.
  • Vitamin E: Acts as an antioxidant, protecting cell membranes from damage. Available in nuts, seeds, and green leafy vegetables.
  • Vitamin K: Crucial for blood clotting and bone metabolism. Found in green leafy vegetables, fish, meat, and dairy products.
These vitamins support various bodily functions and require dietary fats for proper absorption, highlighting the importance of a balanced diet including healthy fats.

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Most popular questions from this chapter

(LO 7.1) Which of the following describes the fat-soluble vitamins? a. few functions in the body c. stored extensively in tissues b. easily absorbed and excreted d. a and \(c\)

(LO 7.7) Water-soluble vitamins are mostly absorbed into the a. Iymph c. extracellular fluid b. blood d. \(b\) and \(c\)

(LO 7.12) FDA has extensive regulatory control over supplement sales. \(\mathrm{T}\)

(LO 7.3) Which of the following foods is (are) rich in beta-carotene? a. sweet potatoes C. spinach b. pumpkin d. all of the above

(LO 7.6) Vitamin K a. can be made from exposure to sunlight. b. can be obtained from most milk products. c. can be made by digestive tract bacteria. d. \(\mathrm{b}\) and \(\mathrm{c}\)
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