A few years ago, a couple friends and I used St.Therese prayer beads to help us in our weight loss efforts. (You can use this principle in fasting too!) Each time we felt like eating an unhealthy food, we would offer it up as a prayer for the unborn or some other prayer request. It was a small sacrifice on my part, but when something is offered up to Jesus it becomes a powerful prayer. While it may be hard to deprive myself of an unhealthy food craving, it becomes easier once I offer it up for someone who can use the prayers such as the unborn.
Evania1 it's funny you mention these two subjects. Yesterday I was listening to a CD about a Priest talking about St. Therese "The Little Flower" and her miraculous powers. I am currently trying to lose weight and just got finished registering my 2lb weight loss on a website.