American nutrition panels list total sugars and then, indented beneath, added sugars. The second line is not something a laboratory can determine, and that fact shaped how the rule works.
Chemistry cannot distinguish the two
Sucrose from cane and sucrose already present in fruit are the same molecule. An analytical instrument examining a finished product cannot tell which arrived by which route.
The added sugars figure therefore comes from the manufacturer's own records of what went into the formulation, not from testing the product on the shelf.
Enforcement consequently relies on documentation. A company must be able to show the recipe and ingredient specifications that justify the declared number.
The definition turns on processing, not source
Added sugars include sugars and syrups added during preparation or packaging, along with sugars from concentrated fruit juices beyond what the equivalent whole fruit would supply.
Juice concentrate is captured because concentrating removes water and fiber, leaving a sweetener that functions in a formulation the way any other syrup would.
Fermentation and other processes that consume sugars complicate the accounting, which is why particular product types, such as certain dairy and fermented foods, needed specific guidance.
Context values give the number a scale
The panel expresses added sugars as a percentage of a daily value, giving the figure a reference point rather than leaving a bare weight in grams.
That daily value derives from a recommendation that added sugars stay below a share of total calories, translating a proportional guideline into a fixed gram figure.
Because the reference is fixed while individual calorie needs vary, the percentage is an approximation that overstates the share for a large eater and understates it for a small one.
Manufacturers responded in several directions
Some reformulated to reduce added sugars, replacing part of the sweetener with high-intensity sweeteners or with ingredients that carry sweetness alongside other functions.
Others reduced package serving size, which lowers every figure on the panel proportionally, though serving size rules constrain how far that can be pushed for many categories.
Products with naturally occurring sugars, such as plain dairy and whole fruit, gained an advantage from the distinction, since their total sugars line is now visibly separated from an added sugars line of zero.
What the line does not indicate
The figure describes formulation, not metabolic effect. It does not rank sweeteners against one another or say anything about the rest of the product.
Anyone managing blood glucose has to account for total carbohydrate rather than the added sugars line alone, and that accounting belongs with a clinician or dietitian who knows the individual case.