5 servings/day not okay
During the 6-week study, patients consumed an average of 7.9 servings of caffeine/week on an average of 4.5 days/week and all participants consumed caffeinated beverages on at least 1 day. A total of 825 migraines were reported with an average of 8.4 migraines per adult.
The researchers noted that among patients who typically consumed a higher amount of caffeine (≥1 servings/day), the association with migraine was evident only on days they consumed higher levels of caffeine (≥3 servings/day). However, among those who typically consumed <1 serving/day, even 1-2 servings was associated with migraine that day.
____Overall, compared to days when participants did not consume caffeine, consuming 5 servings/day was associated with the highest odds ratio of migraine that day (2.61), followed by 4 servings (1.41), 3 servings (1.4), 2 servings (0.89), and 1 serving (0.84).____
The results were similar after researchers accounted for other triggers such as alcohol intake, stress, sleep, physical activity, and menstruation.
To rule out the possible impact of participants drinking more caffeine after the onset of migraine to relieve pain, researchers examined the association between caffeine intake and migraine occurrence the following day and the results were similar. (Please see graph below for details)
The authors concluded that along with these results, “additional research is needed to examine the potential effect of caffeine on symptom onset in the subsequent hours and the interplay of sleep, caffeine, anxiety, environmental factors, and migraine.”