Do not, for the sake of food, destroy the work of God. Everything is indeed clean, but it is wrong for anyone to make another stumble by what he eats.
(Rom 14:20 ESV)
Paul says similar things in 1 Cor. 8. We have freedom in Christ. Not freedom to Sin. Indeed, how can we sin any longer who have died to it. We have freedom from the strict dietary laws of the Torah. It appears that those in the Corinthian community were still offended by their non-Kosher brethren and this caused a rift in the church. Paul's point is that if someone so desires to follow Kosher than by all mean do not dissuade him. However, if someone feels compelled to eat any and every type of food but all means. It is often said, "I don't care what other people think." In this text it is vitally important to care about what other think. We all have different level of knowledge and faith. Thus, we bear with much grace those who are less trained in the faith.