We have a probiotic with cranberry extract in, which I use sometimes for that purpose.
Some people can actually at as much fruit as they want and are perfectly fine. I remember when I was first working, so maybe late 70s, early 80s, they were promoting an all fruit lunch as healthy but I could never do it! I seem to need a bit of fruit, but not too much. But you might be one of the lucky ones.
Growing up we were lucky to get any fruit except apples as everyone had an orchard back in the olden days. 😊 Cranberries, blueberries and other berries were plentiful and used mostly for jam. That meant loaded with sugar.
Back then it seems like we could eat a certain amount of sugar without it causing any problems. It was normal to have a pudding every night. So there must be a bunch of other factors affecting our blood sugar levels as well.