I lived on liquid food for about a month after a surgery and when I started eating solid foods again my stomach was actually handling it better than it ever had

I lived on liquid food for about a month after a surgery and when I started eating solid foods again my stomach was actually handling it better than it ever had. I'm not advocating eating liquid foods for months, I thought it was hard as I was hungry all the time in the first week or so. But doctors tell patients that go through some surgeries to eat liquid foods for at least a month before the surgery. How can it be bad? It's not that the bowel movement stops like you are suggesting. Like others have said, please submit some kind of referral if you're going to make such a statement.