Boyf cooked a ridiculously hot vindaloo once and I ate 2 helpings. My wee one had a runny bottom for 2 days after - not too bad though, but there was a definite change. I usually eat a fair amount of hot(ish) food and did so when pregnant as well, usually with no affects - I think that time with the vindaloo was due to it being a bit extreme.
I believe it's important not to change your normal diet too much as your little one will get a little exposure to what you normally eat through your breast milk which will may help if you're going to do baby lead weaning.