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bc--Respectfully, I think you have made an assumption about the bio- halflife of D20. I doubt that it is much different from H20, and any bonding effects of D vs H will be minimized in larger molecules because of the scarcity of the D, even if ingesting a cup of D20. So what if a sugar moelcule has C6H11D1O6? It's not going to affect anything of consequence. X-rays at the denstist are much more dangerous, but I wouldn't worry about them either at 2/year.