hi Melanie
You are kind wanting to help your friend

from experience it is really difficult to hear sometimes. But if your friend likes reading, I think Potatoes not Prozac is such a great read for reassuring information about biochemistry and why we feel as we do

and practical demonstrations of your own lovely meals might go a long way I do love impressing people with my picnic lunch box I don't think I have got anywhere yet with my friends but it is kind of there if they ever want to join in