Well, I know that Hal Huggins (one mercury expert), advises against sugar, milk, caffeine, wheat etc as causing problems in mercury toxicity. He tends to emphasise proteins like beef, eggs, turkey etc and butter as aiding the process of detox.
He said he has not been able to cure a vegetarian yet.

For me personally? I don't handle caffeine too well, I find that once I start, I can't stop having it and my heart speeds up also. I feel it puts a bit of extra stress on my adrenal glands too.