[johnward]

On a keto diet you can still consume a good amount of fiber (in the form of green veggies or supplements) and a serving or two of berries. Most other fruits contain too much sugar though.

To the original point, if you consume fruit you're not really cutting out "sugar". The OP probably means added sugar.

[DrScump]

Psyllium fiber is your friend. It even adds a nice texture to eggs and such.