You don't really have to throw everything out, just the stupid conclusions. If you take the same studies & data that supposedly show high LDL causes heart disease & you control for low triglycerides you find there is actually a negative correlation between high LDL & all cause mortality. LDL can be separated into different quality lipid particles, those poorly formed from conversion of sugar & carbs into fats (which form plaque), or those from healthy stable saturated animal fats. Low trigs are the best indication that most of your LDL particles are the large fluffy kind from animal fats rather than from sugars. So when you control for the thing that indicates lower carb consumption you get longer life. And it lines up with lots of other stuff, sugar rots your teeth, sugar feeds cancer - they literally dye glucose to identify cancers in scans because cancer cells consume glucose faster than everything else. So a low sugar diet reduces cancer growth. Sugar consumption causes diabetes & pancreatic issues. Steve Jobs (the sugar addicted fruitarian) died of pancreatic cancer.
There are lots of really intelligent doctors & medical professionals doing great work & studying this stuff, but much like Austrians in the economics world they are censored & attacked & treated like black sheep.
We aren't starting from zero, you just don't want to let go of the BS you think you know.