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The Science of Nutrition

Proteins and Amino Acids

Proteins

Proteins are complex organic molecules made up of small units called amino acids. There are 20 different amino acids that can be combined to make a protein, each with a unique structure and function. Proteins are essential for building and repairing tissues in the body, as well as regulating various physiological processes. Amino acids are used to build and repair tissues, as well as to synthesize hormones, enzymes, and neurotransmitters.

Types of Amino Acids

There are two types of amino acids: essential and non-essential. Essential amino acids cannot be synthesized by the body and must be obtained from the diet, while non-essential amino acids can be synthesized by the body. There are nine essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

Food Sources

Proteins are found in a variety of foods, including meat, poultry, fish, eggs, dairy products, legumes, nuts, and seeds. The amount and quality of protein in a food source can vary, and it is important to consume a variety of protein sources to ensure adequate intake of all essential amino acids.

Protein Quality

Protein quality is determined by the amino acid composition and digestibility of the protein. The digestibility of a protein refers to the amount of protein that is absorbed and utilized by the body. Animal proteins, such as those found in meat, eggs, and dairy products, are typically of higher quality than plant proteins, due to their amino acid composition and digestibility.

Effects of Excess or Inadequate Protein Intake

Excess protein intake can have negative health effects, such as increased risk of kidney damage and cardiovascular disease. However, inadequate protein intake can also lead to negative health outcomes, such as muscle wasting and impaired immune function. It is important to consume an appropriate amount of protein based on individual needs and goals.

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