Soothing Drink Ideal for those with a delicate digestion Can also be made into a kind of porridge Thompsons Unmalted Slippery Elm Food makes an excellent nourishing drink before going to sleep. It helps one to relax and wind down. Older people often have small appetites, yet they still need sound nutrition for normal health and strong immunity. Thompsons Slippery Elm Food has been around for over 100 years. Early settlers in America quickly found out about its strengthening and nutritional properties from the Native American Indians.