How large is 3 ounces of steak? What about an ounce of cheese or half a cup of spaghetti? Doling out food portions for a recipe or a diet plan is always a crapshoot-it's hard to tell 3 ounces from 10. Worse, we simply shovel down our chow until our plates are empty and it's time to leave the table. To help you monitor how much food you put in your mouth, compile a dozen easy conversions for standard servings. Just keep in mind that nutritional information will vary by brand and type of food. Sausage Food portion: 1 oz sausage link Nutritional info: 54 cal, 5 g fat Same size as: Shotgun shell Butter Food portion: 1 tsp butter Nutritional info: 34 cal, 4 g fat Same size as: Tip of thumb Mashed Potatoes Food portion: 1/2 cup mashed potatoes Nutritional info: 112 cal, 5 g fat Same size as: Half an apple Swiss Cheese Food portion: 1 oz cubed Swiss cheese Nutritional info: 107 cal, 8 g fat Same size as: Four dice Cooked Spaghetti Food portion: 1/2 cup cooked spaghetti Nutritional inf