It doesn't matter what they say is healthy or bad for you.  Or whether you follow the advice or not IMO.

Over the years I've met people who have lived to a reasonably ripe old age who have had "good" diet and others who have ignored all the advice.  Several who have virtually lived on junk food and were obese.  Even a few who ignored medically prescribed diets.  Their bodies managed tolerably well  --  until they didn't.  Then they died, often from something that to me didn't seem at all related to their diet.

What I notice most about the obesity "Epidemic" is that contrasted with how we ate when I was a child, or even a young adult (1950s - 70s) is back then meals were the norm for most.  Now for so many it seems meals are incidental larger servings that punctuate almost constant grazing.  Crisps, biscuits, nuts, cereals and almost anything else that can be eaten while doing something else.