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The 24 pages that link to Essential amino acid, each with the reason it gives.

• Amino acidBroader topic: Humans must obtain nine amino acids from food to support protein synthesis.

• TyrosineRelated: Tyrosine is usually nonessential, but becomes conditionally essential when phenylalanine metabolism is impaired.

• CysteineCompared with: Cysteine is generally conditionally essential rather than strictly essential when methionine supply is adequate.

• TryptophanNarrower topic: Tryptophan is essential in humans, so adequate intake depends on food.

• Essential nutrientBroader topic: Humans require nine amino acids from food because their metabolic pathways cannot make enough.

• LysineRelated: Lysine is essential in humans because dietary intake must supply it.

• PhenylalanineNarrower topic: Humans cannot synthesize phenylalanine’s carbon skeleton in sufficient amounts.

• Animal nutritionBroader topic: Dietary protein quality depends partly on supplying amino acids animals cannot make.

• Proteinogenic amino acidRelated: Several proteinogenic amino acids are essential in humans, linking protein composition to nutrition.

• Glutamic acidCompared with: Glutamic acid is nonessential, unlike amino acids that require dietary supply.

• SerineCompared with: Serine is usually nonessential, unlike amino acids in this nutritional class.

• Branched-chain amino acidNarrower topic: All three branched-chain amino acids are essential in humans.

• Dietary proteinBroader topic: Dietary protein must supply all essential amino acids in adequate amounts.

• MethionineNarrower topic: Humans must obtain methionine from food.

• LeucineRelated: Leucine is essential because human metabolism cannot make enough to meet needs.

• HistidineNarrower topic: Humans must obtain histidine from food to meet physiological needs.

• AlanineCompared with: Alanine is nonessential because the body can make it from pyruvate.

• Aspartic acidCompared with: Aspartic acid contrasts with this dietary category because humans can synthesize it.

• GlutamineCompared with: Glutamine is ordinarily nonessential, though demand can exceed synthesis during some stresses.

• ThreonineNarrower topic: Humans must obtain threonine from food.

• ValineNarrower topic: Humans must get valine from food.

• Hartnup diseaseCompared with: Tryptophan is essential, so impaired uptake cannot be offset by human synthesis.

• HypercarnivoreBroader topic: Animal foods provide essential amino acids needed to build the body's proteins.

• IsoleucineRelated: Human cells cannot make enough isoleucine to meet physiological needs.