Center for Weight Control OPTIFAST Free Info Session The Center for Weight Control invites you to a FREE information session to learn about the benefits of OPTIFAST®, a medically monitored weight loss program where the typical patient loses over 50 pounds in just 18 to 24 weeks. Info sessions are held on the first Wednesday of each month at Nashoba Valley Medical Center in Ayer. For more information or to RSVP, please contact Sara Schwarz at NVMC.Optifast@steward.org or by calling 978-784-9313.