I'm also no-poo, but highlight my hair.
I didn't go no-poo to avoid the chemicals (though the daily exposure is surely WAY more than a once every few months highlight that never even touches the scalp). I tried it because I was curious. And the benefits have been not wasting money on shampoo, conditioner, and other hair products, while having the loveliest, easiest to manage hair I've ever had!
I haven't had any highlights done since I stopped using poo...haven't even had a haircut in fact, which is testament to how much better behaved my hair is without poo!
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food