The Effects of Sugar on Gut Health

I've come out pretty strongly against sugar even for kids just realizing especially when we're talking about refined sugar, there's really no dietary need for that. And so I know even but in recent years, like things like the keto diet have become really popular which is not just no sugar but you know, extremely no carbs. And I'm curious that cuts out a lot of even fruits and vegetables at times. I'm just curious if you have a take on that. And if do we need the natural forms of sugar and fruits and vegetables? Do you do have a place?