A naturally occurring chemical called harmane is associated with essential tremor. It is present in meat, but is in very high concentrations in chicken (and I assume other poultry). The theory is that people who develop essential tremor cannot clear harmane as well as those who don't. Anyway, it stands to reason that it might be best to avoid chicken and poultry if essential tremor is an issue for you or runs in your family. https://www.medscape.com/answers/1150290-61693/what-is-the-role-of-harmane-a-heterocyclic-amine-hca-in-the-etiology-of-essential-tremor
This is very interesting because I've had an essential tremor for a long time and according to Eat Right For Your Type (blood type) I should not eat any poultry. I had a bioenergetic assessment done that indicated I should have no poultry. I had a Chinese body type assessment done and AGAIN it indicated that I should not have poultry. Thank you Jessica!