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Essential Amino Acids | Fitness, Health & Exercise Glossary

What Are the 8 Essential Amino Acids and What Are Their Benefits?

Definition of Essential Amino Acids

Essential Amino Acids (also known as Indispensible Amino Acids) are amino acids that cannot be synthesized by the body, and thus must be supplied by diet. 

Essential Amino Acids, while required by the human body to support life, are not called “essential”  because they are more important than other amino acids, but instead because they cannot be produced by the body. In other words, they must be obtained through food sources since the body cannot produce them itself.

Non-essential amino acids are those that are synthesized by the body and do not require dietary supplementation.

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What Is A Complete Protein? Complete vs Incomplete Proteins | Ask The Fitness Nerd

Completely Confused About Complete Proteins? Learn What A Complete Protein Is and How Balance Your Protein Intake

Dear Fitness Nerd,

Can you explain exactly what a complete protein is? I’m 23 and pretty into fitness, working out, etc. I lift weights several times a week and run daily.  But I’m also a vegetarian and concerned I may not be eating enough protein every day to support my activity levels.  I’m also worried that since I primarily eat plant sources of protein, I might not be getting a complete protein. Can you help me out here? Thanks!   – Jessa (San Diego - CA)

A complete protein is a protein source that contains all eight essential amino acids in the sufficient proportions to support normal biological functions.   In adults, the eight essential amino acids are:

• Phenylalanine
• Valine
• Threonine
• Tryptophan
• Isoleucine
• Methionine
• Leucine
• Lysine

These amino acids are called “essential” because the body cannot make them, so they have to be supplied through diet.  Recently, histadine has been added to this list as well, as scientists discovered that adults cannot synthesize it.

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The Skinny on Protein, Carbohydrates and Fats | Nutrition 101

The right combination of carbohydrates, protein and healthy fats is critical to reaching your diet and fitness goals. Learn how it all comes together on your plate.

You’ll often hear myself or fitness and nutrition experts discuss the importance of “balanced-meals” to people who are trying to stay fit and in-shape. But what is a balanced diet? And why is it so critical?

A balanced diet simply means that you provide your body with all of the basic nutrients that it needs to provide you with energy each day, as well as to repair and build tissue.

Even if you laid in bed all day, your body still requires around 1200 calories just to fuel basic functions like breathing, digestion, cellular repair and even thinking. The more active you, the more calories you need.

But calories alone are only part of the picture.

Your body also requires amino acids from protein and lipids from dietary fat to maintain, regenerate or repair tissue, whether that’s skeletal muscle, connective tissue, skin, or nervous tissue.

Protein, carbohydrates and fats are often referred to as “macro-nutrients” because your body needs large amounts of them to perform basic cellular functions.

“Micro-nutrients”, on the other hand, are things like vitamins and minerals, which your body uses in smaller amounts to maintain healthy, functioning cells, tissues and organs.

Let’s take a closer look at each macro-nutrient and the role it plays in remaining healthy and fit.
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