Amino acids

Amino acids are molecules that combine to form proteins. Amino acids and proteins are the building blocks of life.

When proteins are digested or broken down, amino acids are left. The human body uses amino acids to make proteins to help the body:

• Break down food
• Grow
• Repair body tissue
• Perform many other body functions

Amino acids can also be used as a source of energy by the body.

Amino acids are classified into three groups:

• Essential amino acids
• Nonessential amino acids
• Conditional amino acids

ESSENTIAL AMINO ACIDS

• Essential amino acids cannot be made by the body. As a result, they must come from food.
• The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

NONESSENTIAL AMINO ACIDS

Nonessential means that our bodies can produce the amino acid, even if we do not get it from the food we eat. Nonessential amino acids include: alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine.

CONDITIONAL AMINO ACIDS

• Conditional amino acids are usually not essential, except in times of illness and stress.
• Conditional amino acids include: arginine, cysteine, glutamine, tyrosine, glycine, ornithine, proline, and serine.