It’s a more recent ‘thing’ than when I had chemo (almost ten years ago) and it’s designed to reduce chances of eating possibly tainted food when your immune system may be affected. I have no idea why honey is on the list. Alcohol is often on any medico’s list, it’s not particularly good for anything except the taste, but I found that an easy one as chemo made all alcohol taste vile! I was lucky, no nausea at all, no fatigue, no susceptibility to germs and I ate what I could taste (lost my tastebuds on Taxol). But the current regimen is for your protection.