My Doctor Told Me to Lose Weight but I can’t Exercise Because My Knees Hurt, What Can I Do? Dr. Rebecca Manno defines the importance of nutrition and exercise in RA patients and how you can incorporate them both into your lifestyle. In This VideoRebecca Manno, MD, MHSDr. Manno is an Assistant Professor of Medicine in the Division of Rheumatology. The focus of her research is the effect of inflammatory arthritis and vasculitis on muscle, strength, and function; particularly in older patients.