Fussy eaters are created, not born
Fussy eaters can be a problem. Kids are always making comments on their food and declaring that they don't like this or they don't like that, but by the next time they see that food they have forgotten all about it. Except where an overanxious mother feels she needs to try to please the child all the time. The basic anxiety in this situation is the mother's fear that the child will not love her if she forces the child to eat something. The child then uses food to start controlling the mother. Then a tussle of wills begins with the child always the winner.
Most mothers recognize this behavior for what it is and distract the child and the matter is forgotten. Some mothers go in for the 'you will eat this or won't leave the table till you do!' style of management and set the child up for eating disorders in adulthood.
And some mothers give in to every demand, and then reinforce it by constantly reminding the child 'Oh you don't like beans do you?' The mother tells anyone who will listen 'No, he can't eat ...' whatever it is. This sets up a reinforcing cycle in which the child is brainwashed into believing that they can't eat certain foods and so they don't get offered them, so they don't eat them and so on. In one reported case the child would only eat orange juice and crackers.
Satisfying fussy eaters
The solution is to work on the child's psychology. A good approach is to use every child's belief in magic to convince the fussy eater that they can eat something new. Hypnotize the child and tell them a story about a boy who ate a special soup. Describe the magic soup as being some particular color, or having some noticeable ingredient like corn kernels. Then get the mother to make a soup that matches the description of the magic soup.This gets the child eating whatever it is that is missing for their health. The hypnotist can suggest that once the boy drank the soup he was able to eat anything at all.
Then the mother can reinforce the idea of the magic soup to empower the child to try new things. As soon as the child has tried a new food the mother can use this to give the child a unique sense of importance.