CalP

I am thinking about using odwalla bars as meal replacements. One for breakfast and one for lunch to lose weight, and then a third healthy meal. I am also taking a fiber supplement, as I know some of the bars are low in fiber. Furthermore, I had planned to have the Super Protein bar for at least one of the meals a day so I get enough protein. All together the calorie intake would be about 1500 a day, with healthy snacks like fruit and nuts. Of course I would excercise as well, most likely 30-45 min a day. What do you think?
Also has anyone tried this? Or does anyone know about how many pounds a week I can expect to lose?