The vitamin B12 content of meals and items of diet

Abstract

1. The vitamin B₁₂ content of items of diet and of meals was measured after they had been prepared for consumption.2. There was poor agreement between the vitamin B₁₂ contents of meals estimated by measurements on meal homogenates and the contents estimated by calculations involving the weights and vitamin B₁₂ contents of items.3. The average amount of vitamin B₁₂ absorbed per d from a hospital diet was found to be 1.7 μg.