You're listening to Bulletproof Radio with Dave Asprey.

Today's cool fact of the day is that as carbon dioxide levels in the atmosphere increase,

foods lose their nutrient density.

So even if you're eating the very best food you can get, it actually has less nutrients

because it's growing faster because it got more carbon dioxide from the air.

A new study suggests that by the end of this century, rice may not deliver the same

B-vitamin levels that it does today.

Researchers grew 18 varieties of rice in experimental rice patties in China to test what

higher CO2 levels would do.

And the results predicted losses in four vitamins, B1, B2, B5, and B9.

And that matters because those B vitamins help your body do what it's supposed to do,

especially having a healthy brain and having normal fetal development.

They did similar experiments in Japan and found that an average 10.3% decline in protein

and 8% decline in iron and a 5.1% drop in zinc, which supported even further studies in

other crops.

The good news is that vitamin B6 and vitamin E actually increased.

And this matters for all foods we eat, but nine of the world's 10 most rice dependent

countries are in Asia, and the other one, if you're wondering, is Madagascar.

And these researchers are predicting that about 600 million people currently don't have

other options to switch to another food source.

Those people get nutrient deficiencies from rice declines.

What this means is that you want to pay attention to the nutrients you're getting, you want

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