Cans have been lined with BPA to keep food from getting added metals. By heating the food in the can it releases the BPA into the food in higher amounts. Also canned food has been staralised by cooking and preserved with salts. By the time you get to it the nutrition is gone so it’s a filer not a meal. If you are starving and that’s your only option then it will keep you alive for a while. Will it keep you healthy, No. If this is for camping I recommend learning about plants and eat from the earth’s bounty before a can of slop.