Can your diet affect Hemorrhoid flare up?

Or are there certain types of food or ingredients that can make things worse. Also can stress have an affect, and are hemorrhoids hereditary? My mother had an operation for them when she was 40, and my father is 64 and has never had them. I am in my early 30's and had my first one at 30 and second one a month ago, is there anything I can do to help prevent flare up?