things to avoid when breastfeeding?

Leigh
Strongly considering breast feeding. However I was visiting my best friend yesterday and her step mother was telling me of all the many many things I can't eat whilst breast feeding!? Kinda almost put me off with the amount of things she was saying I couldn't have! Any breastfeeding women or women who have breastfeed can advise me on what you were told you cannot eat while breastfeeding?! Thanks a lot :)