Note that a few papers (forgot the link) found that naturally occuring sugar is fine. (I ate a banana and two oranges today and that's already above 24g of sugar, so I got worried and went to do some research..)
It's not that you can eat as much sugar as you want as long as it's not refined. For example, after your fruit consumption, you should have brushed your teeth (according to 'the guidelines'). The thing is that 50 grams of sugar is just really, really low...