If you are really making a drastic change to your diet, then be aware that a few weeks in to it you might feel like warmed over death with headaches, dizziness, grouchiness, etc. I did when I quit meat, dairy and some other stuff.
I even passed a gallstone a couple months after starting that diet, and between passing a kidney stone or a gallstone, I'd rather pass the kidney stone again.
That was a while back, and I stayed on that diet for well over a year and it was one of the healthier feeling and better cycling performing times for me. I've gone back to eating everything again, but not to the extent where I think I'm overindulging on the stuff that doesn't bring much nutrition with it.
Short message in the story: Just be aware that changing to a healthier diet doesn't mean your body won't initially rebel and make you think you did the wrong thing.