Canned foods contain Bisphenol A (BPA) that creates abnormal cardiac ,pipe-Wireless, cancer, kidney damaging sodium Sulfites and sulfur compounds the immune be preservatives can affect the respiratory system.
Food labels on canned vegetables may not say "sulfites" per se, but look for any of these ingredients which have sulfites in them: sulfur dioxide, potassium bisulfite, potassium metabisulfite or sodium sulfite.