You want to get the most out of every food and health card, so try and make sure you're not wasting any morsels or healing by playing them too early. Don't get rid of a nine health card when you've only lost one hit point, for example. There's no time limit here, so it's a good idea to consider your moves carefully. Check regularly how many cards there are left in the deck, and always keep an eye on all of your stats. Playing smart is the best way to make sure you're still alive come the end of the game.