Proteins
Proteins
Are the basic materials of every body cell.
Body cells are constantly wearing out. As a result, they are continuously in need of replacement
Of the six nutrients group, only proteins can make new cells rebuild tissue.
By the age of 4 years, body protein content reaches the adult level of about 18% of body weight.
An adequate supply of proteins in the daily diet is essential for the maintenance of health.
The word protein is a Greek derivation and means “of first importance”.
Composition
Contains carbon, hydrogen and oxygen but in different proportions.
Most important nutrient group because it contains NITROGEN and some sulfur.
Composed of chemical compounds called Amino acids.
Amino acids are sometimes called the building blocks of protein because they are combined to form the thousands of proteins in the human body.
Hereditary determines the specific types of proteins within each person.
Classification
There are 20 amino acids but only 9 are considered essential to human
Essential amino acids are necessary for normal growth and development and must be provided in the diet
Proteins containing all the essential amino acids are high biologic value and are called Complete proteins (high quality)
The non-essential amino acids can be produced in the body if an adequate supply of amino nitrogen is provided in the diet.
Essential Amino Acids
1. Histidine
2. Isoleucine
3. Leucine
4. Lysine
5. Methionine
6. Phenylalanine
7. Treonine
8. Tryptophan
9. Valine
Non-Essentail Amino Acids
1. Alanine
2. Arginine
3. Asparagine
4. Aspartic acid
5. Cysteine
6. Cystine
7. Glutamic acid
8. Glutamine
9. Glycine
10. Hydroxyproline
11. Proline
12. Serine
13. Tyrosine
Incomplete Proteins (low quality) are those that lack one or more of essential amino acids. cannot build tissue without the help of other proteins. The value of each is increased when it is eaten in combination with another incomplete protein, not necessary at the same meal but during the same day. In this way,
Are the basic materials of every body cell.
Body cells are constantly wearing out. As a result, they are continuously in need of replacement
Of the six nutrients group, only proteins can make new cells rebuild tissue.
By the age of 4 years, body protein content reaches the adult level of about 18% of body weight.
An adequate supply of proteins in the daily diet is essential for the maintenance of health.
The word protein is a Greek derivation and means “of first importance”.
Composition
Contains carbon, hydrogen and oxygen but in different proportions.
Most important nutrient group because it contains NITROGEN and some sulfur.
Composed of chemical compounds called Amino acids.
Amino acids are sometimes called the building blocks of protein because they are combined to form the thousands of proteins in the human body.
Hereditary determines the specific types of proteins within each person.
Classification
There are 20 amino acids but only 9 are considered essential to human
Essential amino acids are necessary for normal growth and development and must be provided in the diet
Proteins containing all the essential amino acids are high biologic value and are called Complete proteins (high quality)
The non-essential amino acids can be produced in the body if an adequate supply of amino nitrogen is provided in the diet.
Essential Amino Acids
1. Histidine
2. Isoleucine
3. Leucine
4. Lysine
5. Methionine
6. Phenylalanine
7. Treonine
8. Tryptophan
9. Valine
Non-Essentail Amino Acids
1. Alanine
2. Arginine
3. Asparagine
4. Aspartic acid
5. Cysteine
6. Cystine
7. Glutamic acid
8. Glutamine
9. Glycine
10. Hydroxyproline
11. Proline
12. Serine
13. Tyrosine
Incomplete Proteins (low quality) are those that lack one or more of essential amino acids. cannot build tissue without the help of other proteins. The value of each is increased when it is eaten in combination with another incomplete protein, not necessary at the same meal but during the same day. In this way,