I learned through hard experience that drastically changing diets causes physical problems more than it cures anything. I grew up eating a lot of meat, a lot of cheese, pickles, olives, crackers, beans, rice, stews and the occasional soup, cereal (hot or cold), and peanut butter sandwiches with either honey or jelly. My dad's current wife decided "everyone" in the house needed to eat healthier and changed our meals to include pasta three or four nights a week. I ended up sick more often, physically uncomfortable because my body couldn't process the sudden change and lack of iron, and it probably factored into making me more cranky and unhappy. When I moved to my mom's and my meals reverted to what I was used to, my body stabilized again.
I don't care what the diet is; drastic change traumatizes the body, and unless it's for a health reason, I won't do it. Even then, I don't trust doctors and I will look into other options first, before researching and asking around to find out what other people have experienced with that method.
But, yeah, I agree with y'all. No sense going on a diet unless it's for a health reason.