The researchers found that fructose, glucose and mannose each formed hydrogen bonds of different lengths: sweeter-tasting sugars formed tighter, stronger bonds. The strength of the molecules’ hydrogen bonds may be the primary factor in determining a sugar’s level of sweetness.

See the source article by following the link below:
The researchers found that fructose, glucose and mannose each formed hydrogen bonds of different lengths: sweeter-tasting sugars formed tighter, stronger bonds. The strength of the molecules’ hydrogen bonds may be the primary factor in determining a sugar’s level of sweetness.