Read & Watch: Protein

Overview

The purpose of this lesson is to understand the function of protein in the body and what foods provide protein sources.

Read

Protein-rich foods, including animal and plant-based proteins, can also vary enormously in their quality and their implications for our long-term health.

Directions

  1. Read the text below about protein.
  2. As you read the text and watch the video, focus on these questions:
  • Name three (3) roles proteins play in the body.
  • Give at least 1 example of a food that is a complete source of protein and a food that is an incomplete source of protein.

Read

Proteins are nutrients made up of smaller molecules called amino acids. Recall that there are 20 different amino acids arranged like "beads on a string" to form proteins. These amino acid chains then fold up into a three-dimensional molecule, giving the protein a specific function. Proteins have several important roles in the body. For example, proteins make up antibodies, muscle fibers and enzymes that help control cell and body processes. You need to make sure you have enough protein in your diet to obtain the necessary amino acids to make your proteins.

If you eat more than you need for these purposes, the extra protein is used for energy. The image below shows how many grams of protein you need each day (Figure below). It also shows some foods that are good sources of protein.

An 8 ounce glass of milk has 8 grams, a 3 ounce service of chicken has 20 grams, and a cup of kidney beans has 16 grams of proteins.

Watch

Plant & Animal Proteins - the Building Blocks of the Body [3:45] Links to an external site.

Summary

The simplest advice is to choose moderate amounts of high-quality protein-rich foods from a variety of different sources, including some fish if possible as well as vegetarian sources of protein that are combined for completeness.