Some foods may test positive for glucose, but do not taste sweet. what is a possible explanation?

Glucose is a sugar but it is not that sweet in tasting. If food does not taste sweet, it does not mean that it negative for glucose. Glucose positive test means the breakdown of the metabolic constituents of the food into carbs like glucose, fructose into blood stream, which then act as the energy source of the cells. Fructose and sucrose are what we perceive as sweet.