I'm not sure if this is correct or not, but I've heard that eating more soy products may help reduce hot flashes, because of the phytoestrogens? Maybe with reduction in meat and dairy? Well, they say Japanese women rarely get them because of their diet.
Might be just hearsay though, I'm not sure.
(I haven't had many hot flashes yet, only occasionally at night, so that's something to look forward to, I guess)