the often conflated issue with such things as increased need for trace vitamins minerals & amino acids... the higher the stress, the more the brain and body burns of these add to that physical fatigue and you have an ever increasing loss of nutrients that cant be put back into the body fast enough. add to that athletes and people who push their body & mind to breaking points professionally and for hobby's and sports, and you have the ever increasing drive behind super foods and the stomach bacterial health(gut health science) because having an extra 5% (body &/or mind)energy makes the difference between winning or loosing.