TigerLily, I think I was really lucky (in a really weird way) that my son had clear food sensitivities and reactions to gluten, dairy, corn and soy, while nursing. I basically _had_ to cut them or continue watching him in pain. It felt like I didn't have an option, it was just something I HAD to do for my baby, as his mother, and in ways I'm grateful, b/c I probably never would have followed this path had I not dropped those foods back then. (I had no CLUE how much of an impact on my life it would have.)
I also went through serious withdrawl from gluten and dairy and thought it was INSANE how addictive foods could feel. And prior to quitting, I clung to gluten like there was no tomorrow, trying to justify why I should keep it in, how that couldn't be an issue for him, etc...Once it was out of my system, I have had almost no urge for gluten--esp bread--which was shocking to me--at all. I've had urges for sweets made with gluten free flours, but I think that is more sugar related than gluten related--gluten free subs for sweets have always been acceptable to my pallette, while gf bread is just NOT--blech. (A major reason I wanted to do the whole30 is that I still have a sugar issue. )
Nightshades--my ds shows no sign of having issues with nightshades. So, the motivation is quite different. This is only about me now (I don't *have* to do it for my baby's health). Its also always seemed harder for me to make that decision to drop something than to actually do it--once I do that, it feels a lot easier, prob. because I realize that food--whatever it is--is not necessary for my life, or for my food to be delicious. And now that I'm not having joint issues (seriously, a week ago or so I was in horrible pain b/c its so cold here), I'm super motivated to stick to this, and maybe go all the way with it.
I'm really liking the whole30 as well. In a lot of ways, I'm really an all-or-nothing person, and having the 20% option may have muddied things in *my* head. (I don't know that I would have gone primal without that option in the first place, but now I'm at a place where whole30 seems like something that could really work for me now.)
Fascinating stuff for sure!