Sharing food triggers respect in relations, which engenders reflexivity.

Reflection exercises intellect and serves to exercise reason, which brings forth
important things like responsibility and accountability in relationships.

Such elements enrich the depth and quality of relations by enhancing the degree of Human-ness experienced.

Certainly groups are able to reduce selfishness and ego-driven interaction by teaching children to share and care before learning to walk.

This results in a learned reflexive response over-riding the possessive instinct in infants that causes them to grasp tightly to things and has echoes of times living in trees.

The important outcome is that selfishness and ego-driven behaviour is discouraged and sociability and good will are engendered as humanising qualities.