Easiest way to check is by comparing the carbs/fibre/sugars and calories of the two (zucchini & chayote) in www.nutritiondata.self.com
is just follow the protocol sheet, but that is up to you. For instance, I used nopales while on P1 and they aren't on the list, but it was my choice as I still had some to get rid of just after I started. Just so you know,
, I'm not suggesting that you go off plan, but you will be armed with more info to make your decision for other phases if you choose.