According to Erik Erikson anyway. Erikson, Erik. Identity: Youth and crisis. 1968 p. 138 if you want to look it up.
So the saying “You are what you eat” would be correct if you love eating. The better way to put it is the Eriksonian way – You are what you love. What ever it is you love is who you are. If you love you wife – she is your everything. If you love yourself – you IS your everything.
Whatever you love defines you.