Medifast (MED) Gains on OPTAVIA Strength, SG&A Costs Rise Posted byZacks Equity Research December 24, 2021 Leave a comment on Medifast (MED) Gains on OPTAVIA Strength, SG&A Costs Rise Medifast (MED) has been gaining on strength of its OPTAVIA lifestyle solution and coaching support system, which was a major driver in the third quarter.