How do you control your daily sugar intake?

Currently, the FDA doesn't suggest a recommended daily limit for sugar,so it's hard to tell if this 65 grams in a bottle of soda is a little or a lot.But the World Health Organization recommends limiting sugar to just 5% of your total calories,or about 25 grams per day.So, 65 grams is well over twice that amount.But just what is sugar?What's the difference between glucose and fructose?