By what authority are things declared "clean" or "unclean".  Mayors and governors have tried to prohibit the sale certain foods and drinks that they have deemed "unhealthy."  Even presidents have tried to mandate vaccinations and declare "unclean" those who are not vaccinated as if some type of utopia or paradise will be ushered in.  Jesus reacts o what makes a person clean or unclean and it's not by prohibiting McDonald's.