In nature, fructose is usually found in about equal parts with glucose, but high-fructose corn syrup (at least the stuff used in beverages, maybe more) has more fructose than glucose.
Weird quirk about our digestion, fructose is absorbed 1:1 with glucose, so if there’s less glucose than fructose, some fructose gets left behind as excess free fructose, and that fructose can go and play with other parts of the body. It’s been found to cause childhood asthma, hypertension, coronary heart disease, and allergic sensitization.