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Macronutrients – Proteins

Methionine

A sulfur-containing amino acid essential for detoxification and cell function.

Definition

An essential amino acid containing sulfur that supports detoxification, collagen synthesis, and serves as a methyl donor for cellular processes.

How it works

Methionine is unique among amino acids for containing sulfur and serving as the body's primary methyl donor through its conversion to S-adenosylmethionine (SAM). This role makes it fundamental to detoxification processes, DNA methylation, and countless metabolic reactions. Methionine is particularly limited in plant-based proteins, making it a concern for vegetarians unless carefully balanced. The amino acid is essential for carnitine synthesis, glutathione production (the body's master antioxidant), and myelin formation around nerve cells. Excessive intake has been linked to elevated homocysteine levels, making balanced consumption important.

Role

Supports detoxification pathways, enables DNA methylation, and facilitates carnitine and glutathione synthesis.

Examples

  • Beef
  • Chicken
  • Fish
  • Eggs
  • Garlic
  • Onions
  • Sesame seeds
  • Brazil nuts
  • Soy
  • Lentils

Recommendations

Include methionine-rich foods as part of balanced protein intake, particularly plant-based sources like garlic and onions. Monitor homocysteine levels if supplementing high doses.

Key takeaway

Methionine is essential for detoxification and cellular methylation processes.

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