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"Heavy water won't hurt you at all, the chemical differences are minute. You could drink a gallon of it and not even burp, which you can't say about Coke."

I don't know about that. I suspect if you drank enough D2O that it would screw up a lot of your enzyme kinetics.

"There is no such thing as "depleted deuterium", though. There's "depleted uranium" in which the U235 has been taken out (leaving the remaining U238 depleted in 235). But the same language does not apply to deuterium."

And this is simply wrong. "depleted deuterium" is simply plain old water with the 0.015% of natural deuterium removed--exactly like "depleted uranium" is natural uranium with the U-235 fraction remeoved. The expression is unusual, but not incorrect.

I missed that he was talking about the stuff left over after taking the deuterium out!

That would make it "depleted deuterium".

Wait until the health food marketers here in the USA start importing "depleted deuterium" and touting its health benefits.

As for detrimental effects, I think that it would take a lot of D2O to mess things up- H2O is 18, D2O 20, and exists in nature. D2O is pretty expensive to play with, unfortunately.