I think it is really tricky when you genuinely believe that what you are doing is right, healthy, sensible, and others, particularly those closest buck against you. Firstly, you have to do what you feel is right for your own health.
I talk about this stuff at home, about the Gary Taubes book I am reading and all the interesting (and scary) stuff in it. I suggest to my wife she might like to take a look after I have finished it, and I get a "eh I might do one day"!
Then, when I complain about the kids eating crisps, carbs of all sorts for their lunches and snacks, I am made to be the villain, the person pressing their view on others. But I don't want my kids to end up insulin resistant and all the problems that go with that in future life. I am seen as a nag. Even the beliefs that oaty muesli bars are healthy because they 'have oats in them' drives me up the wall, the ignorance of it.
My wife is very supportive in so many ways, but this almost polar opposites on eating habits is hard to handle, to the point that I just say nothing and hope the kids will do better when they make their own choices. Oh well :-(