I have lived in 3 continents (Africa [Nigeria], Asia [India], and North America [US]) and vacationed a few times in Europe [mainly England and Switzerland]. This, IMO is good advice. Contrary to popular belief, people around the world are good. They are willing to help you out and are less likely to take advantage of the fact that you are new there. There is also a sense of curiosity - about who you are, where you ar…
I got sick a few times from street-vendor food in 3rd world countries. It turned out that they often reuse oil for too long. I now avoid deep-fried food, dirty or tap water, and things like ice-cream. I've been fine on my travels since.
Plus, the true meaning of third world is something quite different, concocted during the cold war: http://en.wikipedia.org/wiki/Third_World