I've eaten Seitan. I like it but eat it once in a very great while. I can see there could be an issue with it, especially with the amount of GMO wheat.
shark is an issue because it is so high on the food chain, that the toxins are built up in their body from the amount of other fish they've consumed, as they are an apex predator. Swordfish is the same problem.I wouldn't eat either of them. I've been to seafood restaurants with my folks as we all like fish, and have seen people ordering shark. If I eat fish, it's either sardines, wild salmon, tilapia, farmed trout bought at the health food store co-op from local source; sometimes specific tuna again from the health food co-op. I think also many species of shark are endangered. The Marine Stewardship Council and Monteray Bay Aquarium have wallet-size sustainable fishing cards that discuss this kind of thing.
I also love green tea and do drink coffee, but don't add refined sugar to either. I don't use refined sugar at all.