Discover the elusive world of citrin allergies in children, a rare but baffling condition that challenges parents and pediatricians alike.
– by Klaus
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Bioavailability and daily requirement of vitamin B12 in adult humans: an observational study of its colonic absorption and daily excretion as measured by [13C]-cyanocobalamin kinetics.
Kurpad et al., Am J Clin Nutr 2023
DOI: 10.1016/j.ajcnut.2023.08.020
Ho-ho-ho! Gather ’round, my curious elves, for I have a tale that’s as intriguing as a sleigh ride under the starry night sky. It’s a story about the magical world of vitamin B12 and how our jolly vegetarian friends might be getting by without finding themselves on the ‘nutritional naughty list’.
In the land of health and nutrition, there’s been a bit of a Christmas mystery. You see, the elves who prefer greens over meat—a jolly bunch known as vegetarians—seem to have lower than expected cases of vitamin B12 deficiency. How could this be, you ask? Well, it seems they might have some tricks up their sleeves, or rather, in their tummies!
A group of bright-eyed scientists, as busy as elves on Christmas Eve, set out to unwrap this puzzle using a special tracer called [13C]-cyanocobalamin. They wanted to see just how well B12 was absorbed from the small and large intestine and how quickly it waved goodbye to the body.
They gathered some normal participants—good folks who, I’m sure, were on the ‘nice list’—and gave them a tiny dose of this tracer. Over the course of 12 hours, they found that a surprising 63% of B12 was absorbed. And would you believe, there was a late absorption peak, like a surprise gift found behind the tree, accounting for 12% of the absorption after about 8.7 hours!
But the magic doesn’t stop there! These clever scientists also discovered that B12 is absorbed in the human colon, with about 7% bioavailability. It’s like finding out that reindeer can do more than just fly—they can also dance the Nutcracker!
And what about the rate at which B12 leaves the body? Well, it’s a slow and steady 0.7 μg per day, suggesting that the daily requirement for these participants might just be a tiny 1 μg. It’s like needing only a sprinkle of fairy dust to get the sleigh off the ground.
So, my dear friends, this study, registered in the Clinical Trials Registry of India (and as easy to find as a bright red nose on a foggy night), shows us that the colon might just be a secret workshop for B12 absorption. And with a lower daily requirement, it’s no wonder that our vegetarian pals can still have a holly, jolly Christmas without a B12 deficiency.
And with that, I must return to my workshop. But remember, whether you feast on tofu or turkey, keep your spirits bright and your health in check, for a merry body makes a merry heart. Merry nutrition to all, and to all a good bite! 🎅🎄