| I do read my food labels before I buy them the first time, after that I rarely bother when buying the same item for 2nd, 3rd, ... times. But I usually read them again before I cook.
As in food labelling, the most important thing for me is their expire dates. Canned food are OK, as a lot of time their expire date will be in another 2-3 years. But I will make sure that the can is in good condition, no dent or any slight damage, as it will allow the growth of the microbes and let the oxygen react with the can. | 
