100 grams of olives delivers the equivalent of 20 micrograms of retinol (assuming that the body is capable of converting carotenes to retinol). Lamb’s liver delivers 7,392 micrograms of retinol per 100 grams. That means we would need to eat three kilograms of olives (4,350 calories) or eight grams of lamb’s liver (11 calories) to meet the recommended dietary allowance of vitamin A.
