In Digest #946, Julie & Critters wrote:
"Many stainless steel products have copper clad bottoms.  Excessive copper is 
found in women with breast cancer.  PVC's have been known to cause brain 
cancer.  This is what the doctor advised about a friend of mine that recently 
was diagnosed with brain cancer. All things in moderation.  As for colloidal 
minerals, none of the discussions surround stainless or plastics revolved 
around recommendations for minerals of any sort.  The discussions were about 
containers used for feeding and watering humans and animals and what was best 
for the health of all."

Julie, if you're happy with using earthenware and glass exclusively, then fine. 
What concerns me is people tossing out expensive stainless cookware or high 
quality plastic storage containers for no good reason. BTW, how can one get 
copper from the base of a saucepan into the food, anyhow?