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Senna and Cascara are laxatives. You might posibly weigh a few pounds less after taking them, but this is not true weight loss. I don't know of any special effect from navy beans, except they might give you gas. Have you tried joining any of the weight loss programs such as Weight Watchers, TOPS, etc. The only way to lose weight permanently is through sensible diet and exercise. There are no magic bullets. Depending on your weight, don't expect or try to lose more than 1-2 pounds per week, unless you now weigh at least 200-300 pounds or more.