My DP had similar concerns when I did slim fast:
“It’s not real food, DD will grow up thinking diets like that are normal”
“You can’t eat with us, it ruins family time”
& also that he was worried I would get aggravated and hypoglycaemic and make “everyone’s life hell”
I am still subbing breakfast for a shake as didn’t used to eat that at all, but otherwise using portion control.
I’ve lost 5 lbs so far.
I told him I wanted to do couch to 5k and thought he’d laugh at me or have some issue with it like the diet. Instead he said he would help anyway he can, do it with me if I want him to, and also said “make sure your swimming and doing Pilates too on your dad off or you might get stiff as you’re not used to running much.”
He offered to do some sponsored fun runs and even a marathon with me if I like. He said “it will be good for both of our healths, mentally as well as physically.”
Sometimes I hate him for criticising me, but ultimately he wants me to be healthy so I can be the best Mum to our kids as I can be for as long as I can.
He was genuinely worried for my health on crash diets I think