home > liz hill, rd article smallermediumlarger Liz Hill, RD Writer, WebMD, Inc. Liz Hill, RD, is a nutrition information specialist at the Food and Nutrition Center at the U.S. Department of Agriculture in Beltsville, Md. STAY INFORMED Get the latest health and medical information delivered direct to your inbox! From Featured Centers Feeling Short of Breath? What Radiation Can Do For Cancer Top 3 Anaphylaxis Triggers Health Solutions From Our Sponsors Fight Metastatic Breast Cancer Knee Treatment Plan Exclusives What Does Psoriasis Look Like? How to Prevent Muscle Cramps Blood Clot? Know the Signs and Symptoms Allergy Triggers: Do You Know Yours?