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" Accomplished callers have an advantage because they can make any sound that 's in their call , " Keller says . Bright lights and sun glare can produce head pain . Use of electronic clinical decision support , patient reminders , and alert systems , however , can be predicted to grow more slowly , the authors say . Common offenders include alcohol , especially beer and red wine ; aged cheeses ; chocolate ; fermented , pickled or marinated foods ; aspartame ; caffeine ; monosodium glutamate — a key ingredient in some Asian foods ; certain seasonings ; and many canned and processed foods . Other foods implicated in outbreaks included baked goods , beverages , fruit salads , and miscellaneous cold foods such as aspic glaze ( obtained from powdered gelatin , used to retain the fresh look of food products while extending shelf life ) , rice dressing , and canned salmon . Some legal scholars , for example , are considering whether the legal system can justify common but arguably cruel farming practices , like the close confinement of animals raised for slaughter . The ova are more resistant but can be easily removed by mechanical action of handwashing ( Borgatta , 1989 ) .