I stayed in Chiang Mai in the northern region of Thailand. We found a lot of places that were more wholesome with their cooking. One such place called 'Happy Green' is 100% vegan and grows all its own fruit and vegetables in a huge garden next to the restaurant. They do raw and cooked food that is oil and sugar free (and some stuff salt free). It so clean and delicious! We also bought a lot of own fruit and vegetables from the markets and cooked our own food in our kitchen at the place we were staying.