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Macronutrients – Proteins

Phenylalanine

An amino acid precursor for neurotransmitters that affect focus and mood.

Definition

An essential amino acid serving as the precursor for tyrosine and important neurotransmitters including dopamine, norepinephrine, and epinephrine.

How it works

Phenylalanine is an essential amino acid with a special role as the precursor for tyrosine, which is then converted to dopamine, norepinephrine, and epinephrine. These catecholamine neurotransmitters regulate mood, motivation, focus, and stress response, making phenylalanine important for mental performance. The amino acid is also involved in the synthesis of certain hormones and other important molecules. Individuals with phenylketonuria (PKU), a rare genetic condition, must carefully monitor phenylalanine intake due to inability to metabolize it. Phenylalanine is also the parent structure of aspartame, an artificial sweetener used in diet products.

Role

Produces dopamine and other neurotransmitters that improve focus, mood, motivation, and stress resilience.

Examples

  • Chicken
  • Beef
  • Fish
  • Eggs
  • Almonds
  • Peanuts
  • Soy
  • Cheese
  • Milk
  • Turkey

Recommendations

Include phenylalanine-rich proteins to support mental clarity and mood stability. Consume with carbohydrates and B vitamins to enhance conversion to neurotransmitters.

Key takeaway

Phenylalanine creates dopamine and related neurotransmitters that enhance focus and mood.

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