Where is list sugar in grams, the number does not distinguish between naturally occurring sugars (like lactose in milk or fructose in fruit) and added sugar (like high-fructose corn syrup or brown rice syrup). A more complete review is to read the ingredients for sources of added sugar. Look for the sugar words, as in palm sugar or invert sugar; sweetener, as in corn sweetener; or high-fructose corn syrup, syrup (as in brown rice syrup or malt syrup). Also watch for words ending in ose, like fructose or glucose.
From a health perspective, do not bother thinking twice about consuming a product that lists sugar as one of the first two ingredients. Ingredients are ordered by volume, so the higher up on the list an ingredient is, the more of it a product contains. Naturally occurring sugar like those in fruits and vegetables are not listed in this section. Although this method is not foolproof, it is an easy way to single out packaged items that include a lot of added sugar. Because sometimes manufacturers split up sugar into dextrose, high-fructose corn syrup, cane crystals and so on, so none of them are the first ingredient, even though if you added them up, they undoubtedly could be. Accordingly, it is smart consumption avoiding any product if there is sugar in more than one form.