how is sugar measured in things like unsweetened oat milk when it says “no sugar added” but yet has sugar per 100ml in the nutrients table?

Question

Edit: thank you so much for all the answers!:) I think my question wasn’t too clear. Sorry about that. I do understand that there is sugar naturally in our food. I am just wondering how it is measured when nothing is added. E.g my oat milk says 5g of sugar per 100ml. But since no sugar is added, how could 5g per 100ml be determined? How do they know?

In: Chemistry

Answer 1

Turns out it’s [added enzymes which break down starch to form sugars (mainly maltose)](https://www.jeffnobbs.com/posts/is-oatly-healthy#:~:text=Sugars%20%2D%207%20g&text=It%20turns%20out%20the%20added,%2C%20primarily%20maltose%20%5B1%5D.)

This is the same way how saliva enzymes starts to break down starchy foods to sugars too (you may have done that experiment at school?)