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IMHO the only safe thing is to be vigilant and careful in whatever you put in your mouth and swallow. Example: I never use the plastic container to heat stuff in a microwave - I always put the food in a glass Pyrex dish to heat. Same with cans. Take the food out of the can as soon as it's opened. Put it in a glass jar (peanut butter jars are great for this) and keep it that way. You even could heat the food in a microwave proof glass container and then refrigerate it. Serve it to the cat/animal that way. Not sure this is perfect, but it's a good start.

Once again you're making statements with no documentation to support your claims.
Unless you can direct me to something concrete, I am not going to take this seriously.

I have a male Maine Coon and he only gets dry - nothing more.[:)]

My cat of about 14 got this disease, and the vet said it was more prevalent on the East coast (I lived in Penn.). She took a pill everyday of her life from that day forward, and lived to 18. I wonder now about the canned cat foods also. I have changed from feeding them only moist catfoods, to Wellness brand dry food (mostly vegetarian fruits, vegetables and grains) all the time, with a small (fancy feast) half can per day. only time will tell how this pans out!

Edinboro C, Scott-Moncrieff C, Tetrick M, Glickman L.
School of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
PURPOSE: The prevalence of hyperthyroidism in pet cats (benign nodular hyperplasia) has reached epidemic proportions, since it was first described in 1979. Therefore, we tested the hypothesis that consumption of canned foods compared with dry foods increases the risk of hyperthyroidism. Furthermore, the risk associated with lower iodine concentrations in canned foods and chemicals in can linings was evaluated. Secondary hypotheses were that hyperthyroid risk is increased by well water consumption and exposure to environmental endocrine disrupters.METHODS: Case cats (n = 109) had serum T4 concentration >/=5.0 &mgr;g/dl and >/=1 clinical sign of hyperthyroidism; control cats (n = 173) had a serum T4 concentration /=50% canned: OR = 3.45, 95% CI: 1.77, 6.74; <50% canned: OR = 2.84, 95% CI: 1.48, 5.46). Other significant risk factors were use of cans with easy-open lids (vs. dry) (OR = 3.79, 95% CI: 1.68, 8.54), foods without iodine supplementation in any life stage (OR = 4.09, 95% CI: 1.09, 15.40), years of well water consumption (OR = 1.12, 95% CI: 1.02, 1.23), years of exposure to gas fireplaces (OR = 1.16, 95% CI: 1.02, 1.31), age (OR = 1.15, 95% CI: 1.03, 1.29), and female gender (OR = 2.73, 95% CI: 1.38, 5.43).CONCLUSIONS: Endocrine disrupters in food can linings and the environment may explain the recent epidemic of hyperthyroidism in cats, since easy-open cans have gained popularity. This same relationship should also be evaluated in humans.