The Zone is a good way to balance nutrients. It is sensible and has shown positive effects for diabetics.

Any diet that claims to be "metabolic" diet will work.
All that means is it has a bit more "good fats" in the ratio and a bit less carbs (sugar and starchy ones) and uses lower glycemic slower carbs like beans/lentils and other veggies instead.

The Mediterranean diet has these elements with olive oil used liberally. Eating smaller meals also helps alot. I find nuts to be very useful for snacking etc. Sometimes I just have nuts for lunch.

The extra "good fats" slow stomach emptying a bit and prevent
"dumping" which is when the stomach releases high sugar/high carb meals too quickly into the intestines. Dumping causes all sorts of trouble.

http://en.wikipedia.org/wiki/Gastric_dumping_syndrome

While this happens commonly in bariatric (bypass) patients, it can happen in others as well. So moderating meal size, and content are important.