I’m slightly obsessed with what I put in my body. For me, humans, life, and basically everything just boils down to a bunch of chemistry (yup, philosophy and all that stuff is just electrochem and … more reactions! in our brain / nervous system / somewhere in our body. I saw a paper today that was talking about discovering these proteins with strong absorbance at 450 nm (yups, that’s my protein - read on) and it just goes to reinforce that just because we don’t understand something or even possibly know it exists, there is some explination for it in the chemical world). Humans are just particularily interesting and super-well partitioned chemical systems, but in the end, that’s really all I think we are. So, I care about what I’m putting into my reaction - ME! - a lot. Small impurities (like rattle snake venom, or just some icky chemicals in our food) might not make a lot of difference, or they might make all the difference in the world, so I try to keep them out. [Of course, it all depends on what you are trying to do - tiny amounts of oxygen aren’t so great in my flash-quench experiments where it acts as a quencher I don’t know the concentration of, but the protein I use in these flash-quench experiments needs molecular oxygen in our body to catalyze the great C-H bond activation rxn. It’s a really cool protein!] But since I’d like to keep all my proteins functioning until I get really old (indeed, my particular protein, cytochrome P450, is associated with aging) I try not to put in anything in my beaker that is going to do facinating chemistry - and then make it really hard for me to spend a good old life think about it:) [as to P450 - I prefer not bombarding my mitochondrial DNA with ROS, reactive oxygen species. And as a matter of fact, though I don’t know of a connection between food and ROS, P450 IS very sensitive to what we eat - it catalyzes three fourths of the reactions in our liver!!! It can get induced and inhibited by certain chemicals (from our food, obviously, or pills or anything else that makes it down there). FYI, “my protein” isn’t just encoded in 57 genes in my body (and yours!), but it is in all superkingdoms of life and has been studied a ton, in part because it is a superfamily of many different proteins that do similar things and have a heme active site and absorb strongly at 460 nm.]