Brian,
I have owned UD2 for a few years now, read it front to back twice now, experimented with implementing it for various lengths. Unless you are 18 and on steroids it is overkill for anything more than 2 weeks. The diet and exercise regimen are great for a 2 week carb depletion + peak for a show. But to stay on it for more time than that is not necessary or healthy.
Lyle M. is a bright guy, but grossly overtrains himself and others. No offense, but he barely looks like he trains, IMHO precisely because of his methods. Old n Grey and others mentioned this in another recent thread. As an ex LSU defensive back, I know the difference between good coaches vs good players, so am not making deference to this individual's lack of genetics. If you read his other books and website, during his competitive years, he was skating 5+ hours per day, which is absurd.
Check out Clarence Bass' site at
http://www.cbass.com/
At over 70 years old, the dude peaks at 2% bodyfat, stays under 4% all year long. He has many books that cover his diet strategy in great detail.
I am an old dude now, with a thyroid condition, and still keep my fat at 9% or so all year.
Another approach is the paleo crowd, which does produce fat loss, but be very careful. Without adequate carbs, you lose muscle too. Also, stay with organic, grass fed meat as much as you reasonably can. The mainstream stuff at the grocer and restaurants is awful.
Regardless of what approach you take, eat tons of vegetables and a good amount of fruit!
HTH
Dean