I too, heard that Jared's Dad had taken weekly blood test to make sure he remained in good health. I was also told that he didn't have any condiments or cheese on any of his subs. He only ate the vegetarian and the turkey breast with lots of veggies.
Basically he ate bread and veggies with Turkey once a day.
I don't think I personally could do this for any length of time. I would prefer the WW program as it is much healthier and you have more choices. All programs work if you make the program work for you.
One thing you need to remember is this is a life long change and would you be able to maintain this for an indefinite period of time. Also our fat cells are always there just waiting to balloon up again. So as soon as you reach you goal and start eating normally again there is a good chance that the weight will come back rather quickly, with WW it may take a little longer but you can do this for a lifetime and this is something that you must always ask yourself " Am I able to follow this for the rest of my life?" and with the 123 program it is so flexible that the answer is "Yes, I can do this for a lifetime."
Good luck with whatever you decide to do.
Timber