So: red meat and cancer. According to the WHO, scientists have discovered that yet another standard component of our ancestral diet is terribly bad for you. This is one of the more bizarre assertions in a 50-year history of nutrition-related nonsense: that such an august institution should be putting such a dishonest spin on some rather unimpressive research should worry anybody who cares about scientific integrity.
You can find lots of explanations about how this sleight-of-hand was carried out, but Dr. Alex Petrushevski here gives a particularly engaging (and short) summary of the actual research:
In particular, he gives a good exposition on why correlation is not necessarily causation, why low values of correlation should be treated with extreme caution, and why (in the light of the actual data) red meat isn't even close to being a "carcinogen", as the WHO and other authorities have insisted.