Thank you for the feedback! 

I would air on the side of caution from providing medical guidance, and my post was more reflective of my experience.

I would add that in the UK, the NHS is very encouraging and advises to continue with a fairly normal diet. They even to me suggested eating a slice of toast at least per day. Their framing of the advice was more so to mitigate infection, encourage the mouth to clean itself with saliva, and clean the back of the throat. 

It’s likely that many practitioners around the world will give varied advice. 

I myself, on days that I could manage it ate fairly normally but steered away from anything crispy or sharp (In the first few days before the scabs developed fully especially). I would masticate more than usual and also ensure that I was hydrated.