There's a FAQ about that: www.sparkpeople.com/community/ask_the_expe
The short version is that currently it can't be done because there's no standard for defining and reporting sugar. Food producers/manufacturers aren't required to list it, and those who do it voluntarily all do it differently-- some list all sugars lumped together, some list only added sugar, some list sucrose, glucose, fructose, etc each as a separate line, and so on. Some (especially for very sugary foods) don't list it at all. Since most of the database here is based on food producers' reports, if SparkPeople tried to let you track "sugar," you would get a confusing mish-mash of different reports, and it would be no more accurate than your own guess.
The thing you read that said 20g of sugar was talking about added sugar. For now, the best way to track added sugar is by reading labels and trying to reduce the number of things you eat that have sugar listed in the ingredients. If you're not diabetic, you probably don't need to be too concerned about sugar in fruit or natural sugars in dairy, etc.
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