There is VERY little Fructose in most fruits. Do you people even realize that you would never get an abundance of fructose unless you ate Pounds and Pounds and Pounds of fruit.
To find out the effective fructose content of various fruits, see
http://www.nal.usda.gov/fnic/foodcomp/search/Type in your fruit and you will see for yourself how little fructose accounts for various fruits.
Go ahead and have your apple (9.3) AND a banana (6) AND some blueberries (3.7) AND a peach (4.1) AND some strawberries (3) AND an orange (4.6) AND some cantaloupe (4.5) AND some blackberries (4.3) AND a nectarine (3.1) AND some watermelon (5.1) AND a tomato (1.4).
That would be 49.1 grams. And that's a lot of fruit. More than anyone eats I would guess. And that's assuming the liver holds EXACTLY 50 grams, and that none of it would be burned during the day. And, for that matter, that the liver has absolutely no fructose stored at the start of the day.
See what I'm getting at? It's not worth worrying about. If you're not reaching your goals, I seriously doubt it's because of that apple you had.