Heres one answer, based on a set of studies published in the Journal of Personality and Social Psychology , and reported on by Scott Barry Kaufman in his wonderful blog, Beautiful Minds: We watch people like Charlie Sheen BECAUSE they are narcissistic, not in spite of it
Limit sugar-sweetened drinks and foods high in added sugars, refined grains and unhealthy fats
(ang.).
This condition is thought to be linked to very high doses of diacetyl, but the condition can also develop from a variety of other chemicals such as: acetaldehyde (a chemical found in marijuana smoke), metal oxide fumes (by-product of welding), formaldehyde (a chemical present in cigarettes), sulphur dioxide (a pollutant released by burning fossil fuels), ammonia, chlorine, nitrogen oxides, hydrochloric acid and sulphur mustard
In short, why adapt your business to fit a generic POS when you can implement one designed explicitly for your industry