My main confusion about the LDS church dietary constraints (and it’s really applicable to the Catholic Church as well) is how can they justify prohibiting the overconsumption of meat when the NT quite literally says in 1 Timothy that the prohibition of foods is a sign of a false teacher.
3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth.
Now that I think about it, it’s more of a question for Catholicism because there seems to be some confusion within Mormonism on whether or not meat should be avoided but I’ll let Ender address that.
Technically, meats are not prohibited, as they can be eaten every day except for Fridays during Lent (I assume that this is what you are referring to). It is no longer a rule that Catholics must abstain from meat on Fridays (which is in commemoration of the crucifixion), but if we choose not to, we must substitute an act of charity or piety instead.