I agree with you, MrsKoala. I am all for parents being the best judge of their own child's diet.
DD4 ate a genoa salami sandwich every school day for about six years, with dried fruit and a little bag of popcorn. Pure stodge, lots of sugar, and salt and fat, along with whole grain bread which she complained about endlessly because she preferred white bread.
She wouldn't eat breakfast either.
This particular DD was something of a freshairian. She turned up her nose at most dinners I cooked, and actually went hungry instead of eating many times because she couldn't see anything she liked in the fridge or cupboards. Salami was the only lunch meat she would eat, but at home she refused the whole grain bread. The list of what she would eat contained about ten items - cheese pizza, chips, salami, dried mango and apricots with sugar added, pop tarts and all other sugary junk (classified as one item), salty junk including crisps and popcorn, roast chicken and chicken in other forms too but not in any kind of sauce or stew, and mac and cheese. And ramen noodles. No green veg or fresh fruit of any kind.
I baked items like pumpkin and choc chip muffins, banana-chocolate bread and brownies all with added powdered veggies just so that she would at least get some nutrition.
She studied biology and passed Health class with flying colours. None of the nutrition information made a dent in her stubbornness, and nothing I said made a difference.
She grew to 5'6" and how she managed that I do not know. Lovely skin and hair, strong, healthy nails, two fillings.