Enlightened beings want to support the process of life within themselves. They do not want to eat food that doesn’t contribute to the health and well-being of their cells.
Some people think that if they give up junk food and alcohol they will speed their way to enlightenment. But it isn’t really that way. There isn’t a formula for becoming enlightened. especially concerning eating. “If I eat strictly vegan I will be so pure.” Often, this kind of end-point thinking leads to holier than thou behaviors that we have all seen with people who are trying to prove they are “perfect.”
You cannot buy your way into enlightenment by abstaining from one food or another.
Many enlightened people I have known are not terribly concerned with the body anyway. They understand it is a magnificent thing that allows their souls to experience time and physicality but they know that they are not their bodies. On the one hand, they understand that their bodies are dependent on food. But they also know that they are not just dependent on food, because they are beyond all that.