When I started traveling, I could have really used these tips! I knew nothing, so I tried any food I wanted to try, including many dishes on open-air markets. During 7 weeks in Bolivia I had stomach problems four times and the last time I ended up in the hospital with food poisoning... Since then I have learned to select my food more carefully, but still, I got sick quite a lot while traveling in Latin America.
I agree with you that food-wise Asia really beats Latin America by far (even though Peru has some pretty good food!). But even in Malaysia, where I have had some of the most amazing food yet, I got sick of an Indian dish. A whole chilli pepper had somehow managed to smuggle on my plate and before I saw it I had swallowed it. Instantly my face became red and my stomach refused to take any food for days...
I will get some colloidal silver for my next trip, I did not know about that yet.
This one has been my favorite article of yours yet, keep doing what you are doing! :)