The start of diet season - January through April - looks bright for Medifast so far, says the company's CEO Michael MacDonald, as does Medifast's expansion plans into Canada. And while diet and nutrition stocks underperformed the S&P last year, MacDonald says the diet pill craze was not a factor. He also says the recent headlines over Nu Skin's operations in China, as well as Herbalife's fight with Bill Ackman are not having an impact on Medifast's business or digital marketing campaigns.

Disclosure: TheStreet's editorial policy prohibits staff editors and reporters from holding positions in any individual stocks.

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