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).
Fructose - Chemical properties. 1  Fructose is a 6-carbon polyhydroxyketone. 2  Fructose may be anaerobically fermented by yeast or bacteria. 3  Fructose undergoes the Maillard reaction, non-enzymatic browning, with amino acids. 4  Fructose readily dehydrates to give hydroxymethylfurfural (HMF).