I had an epiphany at lunch.
I thought about having an epiphany at lunchtime too, but local deli was out of them.What is wrong with having an epiphany at lunch, grammatically or philosophically? I had quite a few myself.
On the other hand, I think that having an epiphany for lunch would be unwise, nutritionally. One would feel very hungry by 3pm.

Yes! The epiphany diet! Forget Bitcoin!! I have a new way to make millions.

I'd estimate that this diet is probably healthier than at least half of the other fad diets out there.