Has anyone tried this for loosing weight?

A friend of mine said she drank a v8 for lunch and dinner everyday and last week alone she lost 6 pounds. I was totally stunned. I do exercise but I'm so very self conscious about my weight. I'm not obese but I feel like I am. So I wanted to try this. Just to see what happens. Has anyone else ever tried this for loosing weight? And if so did it work?
Has anyone tried this for loosing weight?
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