Sure, what you read is going to affect what you write. It gets your mind in a certain mode and tends to make it what your thoughts revolve around for a while. I worry more about unconsciously, or consciously even, copying those books I'm reading, whether it's the author's style, or even plot scenes. Never want to do that, and while copying a style can be good for those still searching for their writing voice, I certainly want to be discovering my unique phrases, rather than hurrying a good joke or word twist toward clichedom by overusing it. I find that what I'm writing (which right now is a modern-day science fiction) hasn't been hampered by any of the books I've read in the past couple of months, which have included fantasy, science fiction, historical nonfiction, psychological social trends, thriller, and comedy. I do read mostly speculative fiction, but I do try to blend other genres in to give myself a broader taste and experience, and fortunately I don't feel that reading one type of book limits me to writing in that manner. Any reading serves as inspiration for whatever project I'm on.
Though I can understand how some people might have a problem with this. If there's anything similar to it that I've experienced, it's being caught up in a story that I'm writing, and then I read a book in the same genre and start seeing a lot of similarities between creatures, the magic, or the plot itself. It can be discouraging to discover that your idea isn't as fresh or unique to you as you thought. However, that can then serve as further inspiration to twist the story and world all the more and make it stand out from the other books that might deal with similar subject matter or storylines.
www.jrvogt.com