

That humans are apex predators, and we have been so for upwards of 2.5 million years. Following from this, I believe that most chronic illnesses that we have today (e.g. obesity, diabetes, mental illnesses, cardiovascular diseases, arthritis, PCOS, etc.) are caused by us straying from eating diets with lots of fatty meat.
I use Debian stable for my main OS for the stability, security and infrequent updates, and run all of my services in Docker containers to keep everything up to date.