Galvanizing is done with Zinc, and despite what others may say about copper, from what I've read, the copper sulfates that are given off by copper plumbing and red brass fittings also present health problems .... that's why they are bad for fish and vegs .... the use of Aluminum cookware (which is much more refined than the metal used in Aluminum gutters), has been linked to Alzheimer's disease, so use your own discretion on whether or not you want that metal residue in the fish and veggies you plan to eat ....... I'd rather take my chances on plastic gutters for the GBs.

Just my 2 centavos ..........