For instance, a 20-ounce bottle of soda sweetened with HFCS contains about 35 grams of fructose. One gram of sucrose is about half glucose, half fructose, so if you eat a dessert with 50 grams of sugar, you’re getting about 25 grams of fructose. Even agave nectar, which is touted as healthy by many due to its low-glycemic properties, can be as high as 90 percent fructose. Other less processed forms can be as low as 55 percent.
