I find it weird when people are having dreadful trouble with their children, they're given advice by experts, and decide they know better. A friend and his wife had three absolutely demented children, hyperactive, the house was like a bomb site. My hair used to stand on end when I saw what the children were being fed at every single meal.
The school called in a nutritionist who went through the kitchen cupboards and advised the mother to stop feeding the children so much junk, made out a diet for her. The mother told me, very scornfully, that the nutritionist didn't live in the real world, and went back to the junk food and fizzy drinks.
When I was younger I expected people to be logical, the older I get the less I expect it. People get bees in their bonnets, and when reality doesn't provide the expected results they up the unsuccessful experiments, rather than ditching them.