No, nightshades are not bad!
It depends on the context in which you choose to use them.
They may be bad for you if you are trying to heal a condition in which nightshades might give you trouble.
Then, as long as you are in that condition, you would do best to avoid nightshades.
If you are having a problem with a nightshade such as a tomato, then it seems to me that the universe is telling you something like don't eat tomatoes, now.
If you are having trouble understanding yin and yang, then get a book like
The Macrobiotic Way http://www.qualitynaturalfoods.com/s.../macroway.html and read Chapter 9 Yin and Yang or get the cookbook by Kristina Turner
The Self-Healing Cookbook: A Macrobiotic Primer for Healing Body, Mind and Moods With Whole Natural Foods http://www.qualitynaturalfoods.com/s...lcookbook.html.
While it might be fun to teach you the rudimentary basics of yin and yang, I've got other things to do and you could probably learn a lot more from those authors.
Thank you, very much.
bruce Paine