What is parenting?

Reading to kids, driving them to soccer games, making their food, helping them with homework.

How is parenting measured?

Time use surveys.

What if I make it my primary mission as a parent to enforce optimal nutrition for my child, and to lecture the child for five hours a day on nutritional science, and to give the child phobias of all sugary foods and taste aversion to sucrose?

It might stick. Or your kid will forget about it once they get older. Or they'll rebel against your indoctrination and become even fatter than if you hadn't lectured them.