Problem is (I haven't seen the film) the "sugar" content portion of the nutrition label (at least here in the U.S.) may show a very low sugar content but when all carbohydrates are considered, the actual carb content is often quite high. Studies have shown that the human body uses carbs in the same way as it does sugars.
Trick is to determine total carbs, which is then followed by total fibre (all in grams) Subtract the fiber grams from the carb grams and then divide that remainder by 5. The number five is derived from a constant which is 5 grams of sugar equals one teaspoon of actual sugar. Most good diet information states that the adult male can safely consume 10 to 14 teaspoons of sugar daily while the adult female should limit that to 10 to 12. It's found that most people consume 30 to 45 teaspoons! This is any sugar… including the good ones. Fruits, by the way, are often high in sugars.
Additionally, total sugars on the label are often shown as quite low but the next line contains "Sugar Alcohols"… which are constituents of sugar but in alcohol form and are treated by the digestive system as…. sugar.
Carb control is the key to any healthy diet … doing so will automatically limit the sugar consumed