Gillian Anderson Healthy Living Gillian Anderson Celebrity Diet and Workout. Her routine has kept this former X-files star in great shape for years. Gillian stands 5 feet 3 inches, and yet she manages to keep her small frame thin, without being stick skinny. Want to know how she does it? Find out below. Gillian Anderson Diet Gillian Anderson uses portion control for her diet. Gillian Anderson Exercise Gillian loves doing water sports to stay in shape such as; swimming. She also does yoga. Gillian Anderson Favorite Food One of her favs is Sushi. Tweet This Post