Organisational skills for families with managing meal issues

How many different meals does one family know how to prepare for each member of that individual specific family that EVERY member of the family would love to eat? What happens if there is none? But what happens if the kids agree and the parents don’t?

I want to eat hot chips for dinner, nothing else just hot chips.


Managing ingredients: 

When one or more ingredients need to be taken out because parents are trialling different diets to support managing their loved ones health and wellbeing separate to their diagnosis what ones are typically removed first? Is this being done under medical or professional guidance or just something that is being tested based on an individual decision as a parent?