Low carb

http://www.diabetes.co.uk/food/fruit.html

Blueberries are: sugars 7,01/100g

http://ndb.nal.usda.gov/ndb/foods/show/2168?fg=&man=&lfacet=&count=&max=&sort=&qlookup=&offset=&format=Full&new=&measureby=

You can look also at

http://www.diabetes.co.uk/blog/2015/09/sugar-carbs-fruits-most-least/

10 avocados = one banana

Test your habits