Writing according to what is expected by readers

Well, the thing is that it turns out that my reviews for many products are in hot demand. How, you say? I know, I find it hard to believe to, but apparently it is so. The number of people coming to my blog searching for things like diet pill reviews and best ways to lose weight seem only to be increasing, much to my consternation. I mean, how many more times do I write about the best ways to be slim and trim, how to do it healthily and so on. To be very frank, I'm not that much of an expert anyway, well, not any kind of expert at all, but my unseen readers seem to think I am and they're visiting me in droves. How can I disappoint them?