In Jesus’ time, the dominant institution was the kinship system: the family, the private home. That’s why early Christians gathered in house churches, much different from the typical parish today. In Matthew’s Gospel the word house is used many times. Jesus is always going in and out of houses (as in 8:14, 9:10). What happened around the tables in those houses shaped and named the social order. Table friendship ends up defining how we see friendship in general.
Jesus often used domestic settings to rearrange the social order. Nowhere was that truer than with the meal—with whom, where, and what he ate. This is still true today, more than we might imagine. (Another example of Jesus changing the social order is in the relationship between employers and workers.) Jesus’ constant use of table relationships is perhaps his most central re-ritualization of what family means. Note that he is always trying to broaden the circle (see Luke 14:7-24 for three good examples). Jesus brought this all to fullness in his “last supper” with “the twelve.” This was not to emphasize male fellowship, but the full quorum of the twelve tribes of Israel.
.. Jesus didn’t want his community to have a social ethic; he wanted it to be a social ethic. Their very way of eating and organizing themselves was to be an affront to the system of dominance and power. They were to live in a new symbolic universe, especially symbolized by what we now call open table fellowship.
In all cultures, sharing food is a complex interaction that symbolizes social relationships and defines social boundaries almost more than any other daily event. Whom you eat with defines whom you don’t eat with. Certain groups of people eat certain kinds of food. Through our choices and behavior at table, we name and identify ourselves.
.. This might seem like an unfair example to some, but today a vegetarian (or even vegan) diet has become a conscious choice for many because they’ve studied the politics of food: who eats meat and who can’t eat meat; what eating meat is doing not only to our health but even to the planet. Researchers surmise that the meat-heavy Western diet contributes to one-fifth of global emissions on our planet.  Zen master Thich Nhat Hanh writes:
As a spiritual family and a human family, we can all help avert climate change with the practice of mindful eating. Going vegetarian may be the most effective way to stop climate change.