There has been an increase in the number of sports related concussions at the same time that there has been a decrease in the total number of participants in sports suggesting that sports have become more risky or participants have become more susceptible to concussion. A research paper presents the theory that there has been an increase in susceptibility due to a combination of a decrease of nutrients and an increase of toxins in the average player.
And the increased use of glyphosate, an herbicide used in Round-up products, may be adding to the nutrient deficiency by its affect on the enzyme that activates vitamin D to the active hormone form which is needed in the liver for formation of cholesterol sulfate which is needed in the brain to protect against damage after brain trauma.
In addition to sulfate, magnesium and zinc are also essential for the brain’s defense mechanisms. Read more: 
/Disclaimer: Opinions are my own and the information is provided for educational purposes within the guidelines of fair use. While I am a Registered Dietitian this information is not intended to provide individual health guidance. Please see a health professional for individual health care purposes./
- Morley W, Seneff S, Diminished brain resilience syndrome: A modern day neurological pathology of increased susceptibility to mild brain trauma, concussion, and downstream neurodegeneration, Surg Neurol Int. 2014; 5: 97.[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4093745/]