Get a few cattail shoots when they are a foot tall. Just squeeze them hard as low on the stalk as you can grab, pull up, and they'll pop off in your hand. Boil the bottom ends in water for 10 minutes and suck out the starchy core. It's a good, root-crop-tasting starch source and a fist full is probably about 50-100 calories, maybe a little more. Other good spring time starch and sugar sources include burdock roots, wild carrot, acorns, spring beauty corms and the like. Just remember that a cup (8 ounces) packed with raw or cooked, non-starchy vegetables are about 50 calories, give or take. One cup of starchy nuts or vegetables (like acorns or starchy roots) will be between 200-500 calories.