It helps if you visualize the food as what it is to you...
Instead of seeing a can of coke as delicious, see it as more flab on your gut, or as upping your chance for diabetes.
Instead of seeing KFC as yummy chicken, see it as a cancer risk. It bloody is.
The more you read up on nutrition and view other success stories for motivation as you have indicated, the easier it is to re-orientate yourself with food.
I literally can't eat potato chips now, not unless they are organic potatoes cooked in coconut oil at low temperature. I don't see them as a big bag of tasty at the store anymore, i see them as a big bag of pesticides and potential mutagens.
Plus late 30s, is the time you have to start. Your life is literally in danger for heart disease and heart attacks and cancer.
People like to deny how serious an issue diet and health are, because that's how we are built.
I am not sure if you are still in your childhood environment, but i have got friends and family that are very unsupportive about my healthy eating habits.
I am not one of those preachy types either, i tell people one time only about what is good or bad for them then i honestly don't care if they follow it or not. (unless i am dating them)
So yeah, don't let friends or family second guess your taking your diet more seriously.
I mean come on, what's more serious than what goes in your mouth?