Imagine worms so big they become simply irresistible to fish. Thats the size of worms you can grow thanks to Magic Worm Foods combination of 32 essential proteins, fats, minerals, vitamins and carbohydrates. Worms eat their own body weight in food each day so in just two to three weeks, a Magic-fed worms diameter can double in size. You can also spread the food formula on your lawn and garden to keep the earthworm population healthy and working hard for better aeration and water soil penetration. 4-oz. bag. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Worm Food.