Vitamin D update with Vitamin A

The British Medical Journal has published a remarkable paper confirming that low vitamin D levels obtained in the past are a risk factor for developing colon cancer in the future.

But the study contained an even more significant finding -- as Dr. Cannell's site has reported before, vitamin A, even in relatively low amounts, can thwart vitamin D's association with reduced rates of colon cancer.

This is the largest study to date showing vitamin A blocks vitamin D's effect.

Vitamin A production is tightly controlled in your body. The substrate, or source of the vitamin A, are carotenoids from vegetables in your intestine. Your body converts these carotenoid substrates to exactly the right amount of retinol. However, when you take vitamin A as retinol directly, such as in cod liver oil, you bypass all the natural controls in this closed system.

Ideally, you’ll want to provide all the vitamin A and vitamin D substrate your body needs in such a way that your body can regulate both systems naturally.

This is best done by eating colorful vegetables (for vitamin A) and by exposing your skin to sun every day (for vitamin D).
Your family doctor can now order a blood test to find if your Vitamin D3 levels are high enough. If not, supplementation can be done or the right amount of daily sun exposure will do it. Unfortunately, the vast majority work indoors.

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