Picky Eating Leaves A Gap.
Nuggets and pasta cover the calories. They do not cover much else.
A child living on beige food is not short of energy. They are short of zinc, iron, folate, B12 and vitamin D, and those are the exact nutrients running mood, focus, sleep and immunity. The shortfall shows up as behaviour long before it shows up on a blood test.
Every vitamin on the shelf then asks the same impossible thing of a picky child. Taste this. Chew this. Swallow this. That is the point where it stops, and it stops in most homes by week two.
Colds that drag on for weeks, dark shadows under the eyes, a child who is wiped out by Wednesday. Low zinc and low vitamin D slow the immune response down, so ordinary bugs take far longer to shake off than they should.
The 4pm collapse over a dropped toy is rarely about the toy. B vitamins, iron and magnesium run steady energy and emotional regulation, and a beige diet supplies almost none of them.