13.5 Vitamins — Sources and their Importance to Health

Introduction

Vitamins are organic molecules that are important to an organism in small quantities for proper metabolic function. Vitamins allow your body to grow and develop.

Vitamins play important roles in body functions such as metabolism, immunity, and digestion. Important nutrients cannot be synthesized in the organism in sufficient quantities for survival and therefore must be obtained through a balanced diet.

There are 13 essential vitamins, including vitamins A, C, D, E, K, and B vitamins such as riboflavin and folate. The best way to meet your vitamin needs is to eat a balanced diet containing a variety of foods.

This section explains the types of vitamins, their sources, and their importance to health.

Definition

Vitamins: Vitamins are organic molecules that are important to an organism in small quantities for proper metabolic function.

In simple words: Vitamins are organic molecules that the body needs in small amounts to function properly.

Main Idea

• Vitamins are organic molecules that are important to an organism in small quantities for proper metabolic function.
• Vitamins allow your body to grow and develop.
• Vitamins play important roles in body functions such as metabolism, immunity, and digestion.
• Important nutrients cannot be synthesized in the organism in sufficient quantities for survival and therefore must be obtained through a balanced diet.
• There are 13 essential vitamins, including vitamins A, C, D, E, K, and B vitamins such as riboflavin and folate.
• The best way to meet your vitamin needs is to eat a balanced diet containing a variety of foods.
• Vitamins are classified into two types:

Core Concept

Key point: Vitamins are classified as fat-soluble (A, D, E, K) or water-soluble (B, C) based on how they are absorbed, stored, and excreted by the body.

Detailed Explanation

What are Vitamins?

Vitamins are organic molecules that are important to an organism in small quantities for proper metabolic function.

• Vitamins allow your body to grow and develop.
• Vitamins play important roles in body functions such as metabolism, immunity, and digestion.
• Important nutrients cannot be synthesized in the organism in sufficient quantities for survival and therefore must be obtained through a balanced diet.

Key point: Vitamins are organic molecules that the body needs in small amounts to function properly.

Types of Vitamins

1. Fat-soluble vitamins:

• Vitamins A, D, E, and K are fat-soluble.
• The body stores fat-soluble vitamins in fatty tissue and the liver.
• Reserves of these vitamins can stay in the body for days and sometimes months.
• Dietary fats help the body absorb fat-soluble vitamins through the intestinal tract.

2. Water-soluble vitamins:

• Vitamins B and C are water-soluble vitamins.
• They do not stay in the body for long and cannot be stored.
• They leave the body via the urine.
• Because of this, people need a more regular supply of water-soluble vitamins than fat-soluble ones.

Key point: Fat-soluble vitamins are stored in the body, while water-soluble vitamins are not stored and need to be consumed regularly.

Importance of Vitamins to Health

Different vitamins play different roles in the body, and a person requires a different amount of each vitamin to stay healthy.

Vitamins play diverse and essential roles in the body, including:

• Supporting metabolism
• Supporting immune function
• Supporting growth and development
• Supporting bone health
• Providing antioxidant defense
• Maintaining healthy skin, hair, and nails

Key point: Vitamins play diverse and essential roles in the body, including metabolism, immunity, growth, bone health, antioxidant defense, and maintaining healthy skin, hair, and nails.

Balanced Diet and Supplements

• A balanced diet that includes a variety of nutrient-rich food is important for meeting vitamin needs and maintaining overall health.
• Fortified foods and supplements may be appropriate in some cases.
• Anyone taking supplements should be careful not to exceed the maximum dose — too much of any vitamin can lead to health problems.
• Some medications can interact with vitamin supplements.
• Overall, it is important to speak with a healthcare provider before trying any supplement.

Key point: A balanced diet is the best way to meet vitamin needs. Supplements may be appropriate in some cases, but they should be used carefully.