Guess what? The first food I would look for in a survival situation would be a bunch of cattails. Besides being delicious, they are the quickest way to “fill you up” with sustained energy, because their rhizomes (root structures) and shoots are full of easily-digestible starch. In fact, I’ve actually heard that besides its water content, cattail is 80% carbohydrate, about 7% protein and 13% vitamins and minerals.