[eNTi]

Very hard. I tried and failed for the good part of the last 15 years despite mounting evidence (and resurfacing burried one). Dr. Lustig has some good talks online that were revelatory for me at the time of "my transition".

It's kind of with everything else... people are addicted (I certainly still am, after decades of sugar abuse). Then there's a whole culture around that addiction and our natural craving for easy calories (fuck evolution, really).

As with all of those issues (religion, ideology, conspiracy theories) you need to "nudge" people in the right direction so they can "discover" the issues themselves. Facts don't help nearly as much as one might hope and a lot of it is correlation obfuscated by wishful thinking and genetic variability ("but my cousin Joe always drinks a coke a day and still isn't fat!").

Ever tried to convice a smoker of non-smoking? An anti-vaxxer of his narccisistic ignorance? It's always the same pattern.