The less toxic your body is, the healthier you are. The healthier you are, the faster and more efficient your nervous system works. Health is paramount to optimal performance and consistency.
The most obvious toxins are drugs, alcohol, pesticides, heavy metals and household chemicals. So limiting alcohol consumption, eating organic foods and switching to plant based household cleaners can greatly reduce your overall ‘toxic load’. But most of your toxins come from processed foods, especially refined carbs and oils.
Here is a link to an article by Chris Kresser that looks at this concept in more depth.