For example (courtesy of TMQ):
Scripture note: The apostle Paul's Letter to the Romans notes at 14:2, "Some believe in eating anything, while the weak eat only vegetables." Obviously Paul never played flag football with [Tony] Gonzalez, one of the NFL's few vegetarians. The translation is from the New Revised Standard Version, endorsed by most biblical scholars. The New International Version, favored by evangelicals, renders the passage as, "One man's faith allows him to eat everything, but another man, whose faith is weak, eats only vegetables." Evangelical translators want being a vegetarian to sound wimpy!
If the above is tl;dr, the short version for most Christians is, "Weak people eat only vegetables" and for evangelicals it is, "People weak in faith eat only vegetables." Show your strength by eating meat.