There was a similar questing asked by Kristine today in the Weight Loss forum and here's the reply I posted:
An easy way to begin is to click on the Quick Start Guide link on the right side of this page. It will answer a lot of your questions and will explain all the basics to get you started, food lists, portions and all. From there you might want to read a Zone book to get an even better understanding (refer to the book descriptions in the Products tab above).
I've been very successful with the Zone. I lost 100 pounds 13 years ago, and have kept it off (my before and after photos are in the photo album in my signature). I dramatically lowered my blood pressure with Omega RX fish oil to the point my doctor took me off the 2 high BP meds I'd been on for years (and only 2 weeks after starting on Omega RX!). You'll find lots of fish oil info in the OMEGA-3 tab at the top of this page.
As long as you keep eating Zone balanced, you'll be rid of the excess fat for good.