Not big on the texture of Kale, I love Spinach preferably uncooked. Have to cook Kale though, and usually put it in with something else. Roasting most veggies helps get rid of any bitterness I've found. I've read that leafy greens should be the real bottom of the food pyramid, bur I've yet to manage that many leafy greens, other veggies I've got a plenty.
I don't think pizza really is bad for us, I think the way pizza is typically made is bad for us. Replace normal pizza dough with a high fiber alternative, use something like chickpea flour and the fiber is high, carbs are low and it's the best texture I've found as of yet. Add a small amount of coconut flour to the chickpea flour to increase fiber, careful not to much or the flavor is wrong. I'd use cheese personally, but do it margaritas pizza style and go super low on the amount of cheese. Throw on a ton of veggies, red sauce if you wish, in cause I use a white sauce made of extra virgin olive oil and herbs. Most cultures, it seems, have of some form of flatbread they eat, a pizza is just that, flat bread with the meal built in, some careful adjustments and it's healthy.
And in my opinion when it isn't drowning in cheese it actually tastes better as all the flavors are more balanced.
Which isn't to say that I don't still enjoy the taste of a pizza with too much cheese, but if I'm honest, less cheese and more balance of flavor is far more interesting.
Sourdough also seems to improve the texture of gluten free bread. You have to get used to sourdough?! Sourdough was a favorite of mine even before I started experimenting with interesting food, is to die for.
I disagree with the notion that people in general are lactose intolerant, I've read this myself and wasn't impressed with the logic or the quality of the sources to back the ideas. On the logic side of it, just because the milk is for the calves doesn't mean it would by default be bad for people. After all if we applied the same logic to all thr food we eat, we wouldn't eat anything, as it stands to reason that none of the food we eat was made for people, all the food we eat evolved for the plants or animals in question. The Spinach leaf is to catch rain and sun light for the Spinach plant, not to feed a person. Nuts and seeds are for the procreation of the plant in question, again not primarily to feed people. As a rule what an entity eats is not intended for its survival. We can even argue that the sun wasn't made to nourish plants or animals. The interdependence of nature doesn't require things to be intended for thr nourishment of the Other. Even if we bring a God into the equation I'm still not convinced anything was made with its primary intent to feed a person, but I do suspect God made duality to experience something new. Being a nondual entity, it wasn't lacking in anything, so forcing its creation, which is still it, to not remember what it is, and to require nourishment that wasn't primarily intended for it, forces that creation to survive by connecting with other aspects of God. To drink the milk of a calf is to know an aspect of God... I'll call this the Dao of Nourishment.
You're definitely right about just needing to get used to the new foods, in my experience anyway the more we expose ourselves to new tastes the more easily fluid our pallete becomes. Acquiring tastes is a beautiful thing.