Extreme intelligence is mental illness related to autism
Extreme intelligence (the type you see in geniuses) is the result of immune system issues related to viruses embedded in our genome that express themselves if the immune system gets weak. A weaken immune system early in life leads to neurodevelopmental disorders classified as Autism. Autism by itself is really bad, endless pruning of synapses. It is only when it is combined with a virus that the brain is amplified. The viruses induce hyperactive brain disorders due to how they have to manipulate the immune system to replicate. This leads to the OCD and anxiety traits as the immune system upregulates. It also sometimes creates photographic memory in the host. The photographic memory make it possible to make novel connections since creativity is just the associations between existing ideas and concepts. Genius is mostly connecting dots which many people can spot but can't connect. Innovation is more of a problem solving technique applied to available resources and usually that is just time and energy. You can create anything with time and energy.
When the virus switches the brain to become OCD/autistic, there’s no way to disengage the resulting “will to reproduce” and the brain becomes a slave to go after more and more. You don’t feel sick and BUT YOUR body is over reacting to everything so you don’t get sick but you’re burning through nutrients too fast. Some chicken study showed how it attacks the intestine and showed all types of effects, including weight loss and much larger deviations in weight. Along with nerve damage, lower neuron counts at various nerve centers in the body, etc.
If you're wealthy enough to eat super healthy/nutrient rich foods, the body is happy to handle the virus… It’ll eventually lead to a cancer (Steve Jobs) or increase the risk for cancer. The higher you go in the ranks or the hyper intelligent people, those are the ones you see it in most often.