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There is not a lot of caffeine in Diet Coke - only equivalent to about a third of a cup of coffee - so two cans a day is less than a cup of coffee. He may be sensitive to aspartame, he may not be. Only one way to find out obviously - rather than nag him to give up completely why don't you suggest he give it up for two weeks as a controlled experiment and see if the headaches go? Another possibility is that his headaches actually being caused by the painkillers he is taking to combat them - this is quite common apparently. Has he been to the doctor or is that a silly question?
Caffeine content of various drinks and chocolate 1 mug of instant coffee = 100mg 1 cup of instant coffee = 75mg 1 cup of brewed coffee = 100mg 1 cup of tea = 50mg 1 can of cola = 40mg 1 can of "energy" drink = 80mg 1 x 50g bar of plain chocolate = up to 50mg 1 x 50g bar of milk chocolate = up to 25mg
i don't know the science behind, but i know that in my case one of the migraine triggers is caffeine and the other is aspartame. If I drank 2 cans of diet coke everyday I'd have gone literally insane with headaches by now. It's just the worst thing you can give to people with chronic migrains. If he is the migrainy type like me, maybe he'll feel better after giving up both. The effect won't be immediate. In fact, it will get worse before it gets better as the caffeine withdrawal symptoms are terrible -one full week feeling like shit-, but it is worth doing.