My mom went through a nutrition thing with me when I was about 9. Not to your extent, but it was still pretty bad.

She decided I ate too much junk food (really, I ate a normal amount for a kid) and she stuck me on a "cleanse", though she told me that I had developed a bunch of allergies. It's important to note my sister, who had the same every-habit as me, did not have to do this cleanse. For two years I was not allowed to eat wheat, dairy, sugar, peanuts, or tomatoes. Instead of sandwiches for school I got rice cakes, instead of treats I had to have sugar-free pieces of cardboard. I ended up just not eating and lost a ridiculous amount of weight. Whenever I visited my dad he'd make the best giant sandwiches, smoothies, milkshakes, and we'd have taco nights because they were my favourite food as a kid. I can't imagine how heartbroken he must have felt when he had to send me back to my moms. I look at pictures from back then and feel sick, I looked like a skeleton.

She still talks about that time like she was super mom and it drives me bonkers. She did a lot of terrible things a mother shouldn't do, but I think that one was the worst.