It is sometimes hard (or impossible) to completely remove sugar, as some items contain natural sugars e.g. even natural yogurt without added sugar contains suga

It is sometimes hard (or impossible) to completely remove sugar, as some items contain natural sugars e.g. even natural yogurt without added sugar contains sugar from sucrose. There was a diet that gained popularity in my country that was the "5% sugar" diet. Here on the labels of items there is always the per 100g reference, so if the sugar is <=5 on that column, you're good to go. So it's easy to stick to and it's interesting what gets filtered from eating in this way.