Amen on all of these. It's funny that around here we:

1.)Make our own full-fat Greek yogurt with no sugar
2.)Eat lots of good fats, like butter, coconut oil, avacados, eggs, etc.
3.)No diet sodas, but also we don't do aspartame or chemical sweeteners. We do drink sparkling water, though we have learned you have to be careful with that because it's more acidic than regular water and can be hard on your teeth if you drink a lot of it.
4.)We keep soy out quite a bit because it certainly does seem to have a hormonal effect. Coconut or unsweetened almond milk when we are doing dairy-free things, not soy milk.