Can You Eat With Invisalign In?

I was just talking to a new coworker who noticed my Invisalign and said that he just completed his treatment less than a year ago. He said that his treatment course was 27 months long! Then he told me that after about a year he just started eating with them in! He said he couldn't chew or bite off things like meat, but anything on the softer side he would leave them in for. He said it was actually easier because all you have to do is rinse them off when you're done. I am just baffled. I once tried to eat a martini olive with them in and couldn't bring myself to do it. I cannot imagine doing this!