Limiting Amino Acid
Proteins & Amino Acids
Limiting Amino Acid is the essential amino acid with the lowest supply ratio in the tested protein relative to a reference pattern. The limitation is relative, not necessarily the smallest mass listed.
The limiting amino acid has the lowest supply ratio against the reference, not necessarily the smallest absolute amount or complete absence. Changing sources or quantities changes adequacy. Unlimited addition of one amino acid does not solve every dietary gap; the whole mixture and its actual intake need to be assessed.
Scoring commonly expresses amino acids as milligrams per gram of protein and compares them with an age-specific pattern. That differs from a daily requirement in milligrams per kilogram of body mass. Without knowing age group, method and denominator, comparing two quality numbers can be misleading rather than informative.
Combining sources with different amino acid patterns can improve the mixture. Cereals are often relatively low in lysine against a reference pattern, and pulses can help. Healthy adults eating adequate varied diets need not combine every complementary source in the same mouthful; total amount and the daily pattern still matter.
Lysine often limits cereal proteins. Pulses can improve the mixture without automatically correcting too little food overall. Both amino-acid proportions and protein grams matter for the athlete.
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