Earlier quoted context omitted.
And my mother-in-law lost and keeps off over 100 pounds by restricting random food groups, however she still eats very high carb. And when I say random, I really mean random! There's literally no rhyme or reason to her choices other than she thinks they are "bad." Same with my vegan+ friend, high carb, 80 pounds kept off for a decade. I say vegan+ because she's vegan plus she has other random restrictions. Those are…
I also eat carbs I just stay away from them most of the time. That sounds like your mother-in-law if she eats random.
I believe she eats potatoes at every meal or at least almost every meal and she also eats plenty of white rice. Also fruit juice is on her "good" list. Though she claims she "doesn't eat sugar."
She claims to not eat dairy but she eats yogurt because she thinks it's non-dairy. No, she doesn't have a yogurt exception, she honestly thinks it doesn't contain dairy. I'm not sure what she thinks it is.
There's not many foods she does eat and her diet is the same thing for the most part. I honestly think the key to her diet is all the food I've ever had made by her has been bland and unseasoned. If you're eating bland food you aren't prone to overeat.
I think it's absolutely ridiculous and makes no sense but it seems to work for her so I can't judge too harshly.