It has become very popular for tourists to join food tours in Bangkok and in other major cities around Thailand. Of course, you can just walk around yourself for free and buy what you want. But, the advantage of going with a local guide is that they will give you an insight into what you are eating. I have been in Thailand for years, and I consider myself a foodie, but I am not ashamed to admit that I learned something from these food tour guides. There is always something to learn and maybe some new food to discover. The following food tour companies are all based in Bangkok. There are more, but these are the ones that I have been on so far. There are in no particular order.
Bangkok Food Tours: Website | TripAdvisor | Facebook
Chili Paste Tour: Website | Trip Advisor | Facebook
Expique: Website | Trip Advisor | Facebook
Taste of Thailand: Website | Trip Advisor | Facebook
I don’t charge any money for companies to be listed here. I am happy to help promote for free if I think it is a good food tour or cooking class that you are offering. You can contact me here.