Questions about fructose...

So I've been loosely eating animal based diet for quite a while now as it has always seemed the healthiest in theory and in practice for me so far... But after seeing some stuff about fructose and what it does to the body I'm starting to second guess how great fruit is.

I don't really know all that much about sugars, but have been meaning to sit down and research all this stuff about what monosaccharides, disaccharides, glucose, fructose, etc... and all that stuff means and exactly how they differ. And I finally have decided to scratch the surface and right off the bat everything I'm reading says fructose is just TERRIBLE for the human body compared to other sugars. Increases insulin resistance to cause diabetes, causes liver damage, basically that it is toxic at fairly low doses.

Also, I'm not the type of person who is okay with "well it just hurts you a little bit so I can live with that" because I am into longevity (healthspan/anti-aging) so I am only interesting refining my diet into the healthiest diet possible that causes zero damage to the body when it's a practical and affordable option. So, if it's true that fructose could be causing any issues like I described, or inflammation, then would fructose not be technically considered a plant toxin and therefore NOT animal based.

I'm just looking for anyone's opinion here on what you think about this, about fructose, sugars, their safety etc.

From what I read the sugars in dairy are way better for you than those in fruit, but obviously if I cut out fruit that would lead to vitamin C and fiber issues probably.