Question

foods,from puffed or enlarged cans should not be consumed

Answer 1

because it contains more preservatives than we think it is contains of chemicals like nacl2
so3h2 which are poisonous elements

Answer 2

hey mate....
here is your answer.....

Because sometimes it has not only the H2 gas inside the cans that has resulted in its swelling but they give of carbon dioxide witch spoils thr food inside the can and also results in its swelling

hope it helps.......