Andy it would be hard to expect any starch reaction from zucchini, red meat or wine, but if the meat is processed it may have added starch.
I was surprised at the way my "allergies" or sensitivities presented with AS type pain so i had to accept that some non-starch foods foods were bad for ME - like avocado, mango. However, these food sensitivities did not last long because my gut healed significantly and i can happily eat avocado, mango and other foods now.
If you are sure there is no starch at all in your diet, then a sensitivity of some sort must be assumed. This is where i typically went into a "safe foods" mode and restricted my diet severely for a few weeks at the same time as using healing supplements. I think this is the major benefit of a mono-diet - apples, grapes are safe, healing and sustaining.
Each person will have different safe foods because we each have very few foods we can tolerate almost every meal for over a week.......my major one is chicken, but for anyone else i suggest unprocessed foods from outside the documented allergy groups (dairy, seafood, eggs, soy etc. etc.)
Ted
"No illness that can be treated by diet should be treated by any other means."
Maimonides 12th Century