NEW YORK (TheStreet) -- Shares of Weight Watchers International (WTW) - Get Report are rising by 5.72% to $14.05 on heavy trading early Wednesday afternoon, as investor and spokeswoman Oprah Winfrey said she lost 26 pounds using the program in a video posted on Twitter (TWTR) yesterday.

"I love bread," Winfrey said in the video. "I don't deny myself bread. I have bread every day. That's the genius of this program."

In October, the New York-based company's stock similarly soared after the billionaire media mogul said on The Ellen DeGeneres Show that she had lost 15 pounds, Bloomberg noted.

Winfrey took a 10% stake in the company last year and has since upped her stake to almost 15%. She also joined Weight Watcher's board and agreed to participate in advertisements.

Investors are hoping that Winfrey can improve the struggling company, which has had difficulty competing with fitness apps and other programs in the last few years, Bloomberg added.

Weight Watchers stock jumped by more than 20% yesterday.

About 6.01 million of the company's shares have been traded today, compared to its average volume of 4.81 million shares per day.

Separately, TheStreet Ratings Team has a "sell" rating with a score of D+ on the stock.

This is driven by multiple weaknesses, which should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks covered by the team.

The company's weaknesses can be seen in multiple areas, such as its feeble growth in its earnings per share, weak operating cash flow and generally disappointing historical performance in the stock itself.

Recently, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

You can view the full analysis from the report here: WTW

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