Just use a keyword external tool to come up with your own list. You can get a rough estimation on how much they pay if you have an adwords account and pretend as if you are trying to make a bid. You will see how much other advertisers are paying.
You might also want to start on words like diet, healthy foods, health tips and practices.. ahh..there's way too much to mention, you really need to use a keyword tool on this one..