Angie
Hi, the things you are looking at are primarily agents that work on your colon. Navy beans are a great food that have lots of fiber and they are a good source of complex carbohydrates and protein. Senna is used by a lot of people to maintain regularity and cascara grasada is a tree bark that is often used as a mild laxative. For weight loss, your best bet is to find a good Registered Dietitian in your area and have a plan designed specifically for you and your body. THis may not be your most "exciting" route, but it will be your most long term and healthy way to go. GOOD LUCK!