As I said before, feelings are subjective but they're subjective ontologically, not epistemologically. Our well-being is tracked by states of the universe and states of our brains, and because of this science can answer, in principle, questions regarding how best to maximize well-being.
That's nothing but more subjectivity: who defines "well-being"? That comes down to people's feelings. There is no objective way to get from science to "well-being" -- it can't even tell you if the term ought to apply to individuals, families, tribes, nations.....
There was a reason why I directed this moral confusion toward Jews and Muslims, as Christians, as far as I am aware, have no taboo foods except for maybe Good Friday but that's more a liturgical practice than a moral edict. But take my other examples that
do apply to your faith:
homosexuality,
thought crimes, or graven images. What can be argued, besides making appeals to blind obedience to authority, to justify placing these in the purview of morality?
To me the section in the Catholic Catechism is more Aristotle than Scripture. And I still haven't heard a good answer to why, if St. Paul can tell people to just find a wife instead of put up with lust, that argument can't be made for gays.
The "thought crimes" bit is a misnomer, and your reference is making the ancient mistake of taking things out of context. Without the part preceding that "but....", the statements are worthless. A quick read of the context makes it plain that Jesus is talking to people who've been trained in this notion that if they can put their little checkmarks in the boxes next to the rules, saying, "Didn't do that!", then they think they're fine, while He's pointing out that such is not what was meant. Theologically, He's saying that the Law was never concerned with surface behavior, but with changing the person on/from the inside.
Yet even taken out of context, the statements ring true. It's a known reality in psychology that people who practice doing something mentally are more likely to do it in reality (interestingly, an experiment was done with some pro basketball players that demonstrates this even applies to sports performance). It's why in anger management and other kinds of therapy, people are required to mentally rehearse other forms of action.
It's also a misnomer because it's again reading the Bible like a shopping list or a menu, making it about rules. Jesus isn't talking about rules, He's talking about changing people. And the person who runs around undressing others with his eyes and beating off to thoughts of them is degrading himself, making himself less of a person than he could be, because the result of such thoughts is to reduce the other person to an object.
I suppose the graven images bit is stretching the bounds of what we think of as morality. It's more like Serge in Beverly Hills Cop, who says, "Don't be stupid!" -- making images and worshiping them is just, well, stupid.
[note: there was no absolute prohibition against making images; within just a few chapters, God is commanding the making of pomegranates, cherubim, and more, thus indicating that the so-called "second commandment" is actually a footnote to the one before]