The phrase "grams sugar" refers to the amount of sugar in a food or drink. It helps you know how much sugar is in a product. The higher the number of grams of sugar, the sweeter or more sugary the item is. Full definition
The only sure way to know is with an insulin response test (measuring blood sugar and insulin fasting and one and two hours after a 75 - gram sugar drink). (ultrawellnesscenter.com)
One cup of whole dairy milk has almost 150 calories and 13 grams sugar coming from lactose. (8fit.com)