I just thought I'd chime in with one last thing, it hasn't really occurred to me before because my dads family were very vocal about my eating and weight 'problem'-But prior to all that my mum was quite conservative on giving us junk food/sweets and sugary drinks and we generally ate quite natural and healthy foods.
She never said it was because it was unhealthy or fattening, but that it was bad for our teeth. She probably meant it too, as my brother and I were slim and this was in the 90's, so a bit before the childhood obesity issues came over to England. But either way I think it really helped not give me any funny issues with weight/food at a young age.
I think in a way if you're providing healthy foods and plenty of physical activity as you are, I would try and not over think the issue. I wouldn't put too much emphasis on portions/food types whether good or bad. But I imagine that's a lot easier to say than do
