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A travel guide says that vegetables need to be purified before consuming. What are vegetables typically contaminated with and how? Is this true all over Mexico or only in some regions?
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Experimentalphone is in Mexico
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I live in Bangladesh and I am reading the book, The People's Guide to Mexico (2012). In the book there is a section where the author's give instructions on how to purify vegetables with iodine.

Now, Bangladesh has a much lower GDP than Mexico and is much more underdeveloped if you go by international rankings. Even here we do not need to purify vegetables, we just need to purify water.

My questions are:

  • Why do you need to purify vegetables in Mexico? What are they contaminated with and how does the contamination occur?
  • Is this contamination problem everywhere in Mexico or only in some areas? If so, what areas?
  • Is there a similar problem in other Latin American countries?

Here's the section of the book I am referring to: https://imgur.com/a/JkldPwf

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5 months ago