While it's nice that fructose doesn't raise blood sugar like the other monosaccharides, you need to keep in mind that fructose gets preferential uptake treatment by the liver. If you eat too much of a food that contains fructose, you can overwhelm your liver into producing triglycerides (see http://www.ncbi.nlm.nih.gov/pmc/articles/PMC302539). While we're not entirely sure that triglycerides themselves are responsible for ill health, having elevated levels has been linked to all sorts of chronic diseases.