The genetic lottery s another factor that is interesting because they make their recommendations based on some kind of average sample, not the individual. Individuals can vary greatly so what is good for the average can cause massive issues for someone else. What is safe for one, might not be for another. If we think about it like peanut allergies where it kills some people, imagine the issues with all of millions of chemicals we face each day. There must always be a certain number 'allergic' to some components but testing won't show this and the symptoms might be slight but profound.