Sugar, primarily sucrose, is made of carbon, hydrogen, and oxygen. It's found in various forms:

1. Sucrose: Table sugar, made of glucose and fructose.
2. Glucose: Found in fruits, honey, and some vegetables.
3. Fructose: Also in fruits, honey, and some vegetables.
4. Lactose: In milk and dairy products.
5. High-fructose corn syrup (HFCS): Derived from corn starch, used in processed foods and beverages.

The sugar content varies in foods and is listed on labels in grams per serving or as a percentage of the daily intake. Watch out for added sugars, as excessive consumption can lead to health issues.