I can't help but think that letter your group is going to write will embarrass this T and make it uncomfortable for the other Ts too. I think the T already must know he has a problem. Maybe he's trying to change his diet, or maybe it doesn't help. If it is so offensive, perhaps he shouldn't work directly with people, but I think giving the Ts an anonymous letter is childish and mean.

If you must talk to someone about this T, what about talking to one of the other Ts? Then it would be his responsibility to talk to the one with the problem. I call it a problem because I don't think anyone willingly wants to embarrass himself in this way.