I use the Cambridge Diet shakes. This was the only program that I had real lasting success with in the past, so I tracked down a local distributor (PM me for info).
I decided to use these (while waiting on my UHC approval) so that if/when I get approved I will already be well on the way to shrinking my liver. They can be used as a sole source of nutrition and have everything you need in them (although I do take a daily vitamin).
They are a little pricey, about $27 for 21 servings, but they taste really good, just like a regular shake, and they have alternatives such as Soup, oatmeal and Meal Replacement bars.
I've already lost 10lb in 10 days so if I don't get approved I guess I will try to stick with the shakes.