HFCS with very high fructose concentrations are being used in products labeled as "light" or "low-calorie" due to its high sweetness.

AmJournal Clinical Nutrition - Increased consumption of refined carbohydrates...
Bodybuilding.com - Types Of Sweeteners
Secretariat of the Pacific Community #66.doc

If you dig deeper, you'll find studies showing fructose converts to triglycerides more readily than glucose. Not to mention insulin-resistance and glucose-intolerance effects.

Nutrition&Metabolism - Fructose, insulin resistance, and metabolic dyslipidemia
AmJournal Clinical Nutrition - Fructose, weight gain, and the insulin resistance syndrome