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Competition between n-6 and n-3 forms of essential fatty acids (EFA). Typical daily amounts of these acids eaten in the USA as percent of food energy (en%) are for 18-carbon EFA 7% n-6 acids (18:2n-6 + 18:3n-6) and 1% n-3 acids (18:3n-3 + 18:4n-3), but for 20- and 22-carbon HUFA they are only 0.08% n-6 acids (20:3n-6, 20:4n-6, 22:4n-6 + 22:5n-6) and 0.04% n-3 acids (20:5n-3, 22:5n-3 + 22:6n-3).
