@Ralph Lee - If you enter the tournament scene this year, I think you'll be surprised by what the "average skier" is built like. The guys that are getting in to fairly deep short line are, for the most part, in pretty dang good shape. For me, skiing was my trigger to loose a ton of weight, and continues to be my motivation to get in better shape. We all know when we are out of shape, and all have good reasons to do it (family, health, the cost of life insurance...). I did for over a decade - joined gyms, tried every diet there is, tried the fad diet pills. Nothing stuck. You need something to actually make you stick to it. For me, it was skiing.
I'm not a big believer in eliminating carbs....but I do spend a fair amount of time in the gym. I do reduce the carbs in my afternoon meals (depending on the time of year and my goals, I eat between 4 and 7 full meals a day), and eliminate them in my last meal. But, I could still be eating, say, 8-10 baked potatoes a day...
Anyway - there's nothing all that magic about my approach. Low fat, low sugar, low sodium. Eat clean, and often enough to keep your metabolism up (never more than 4 hours between meals). And, or course, exercise. I weight train, but there are other ways to get the body going.
I can't speak much to the differences between PP and ZO. In my fat era, I went for 12 years without skiing at all, so I basically went from manual driving to star gazer (less than one season) to zero off. Once I find the setting that works for me, I love it.
Go get it!