There was once a difference in classification that a Dwarf was below 4' 10, but above 4'' a Midget being 3'- 4' at maturity. However, certainly in England the terms are seen as inter-changeable. Ironically I am good friends with a genetically short family.
Just an example. A sweet onion is about 7% sugar, in-which about 40% of that is Fructose. A white onion (or any non-sweet type) is about 5% sugar, in-which less than 40% is Fructose. The amount of Fructose you are getting from even a few ounces of onion is minute. This Fructose is also bound with the flesh (Fiber) and other forms of sugar (Sucrose and Glucose).
No known cure but an appropriate fructose lowered diet can help (see below for a list of foods high in fructose). Depending on how sensitive the individual is to high fructose foods, they can be eaten in moderation. Lastly, foods with glucose actually help individuals absorb fructose better. Foods with high fructose content: Apples, coconut milk, figs, fruit juice, guavas, high fructose corn syrup (found in soft drinks and sushi rice), honey, lychees, mangos, melons, pawpaws, pears, persimmons, prunes, raisins.