the soda can give caffeine which can cause headaches the days she doesn't drink it.
if she is not eating enough fruits and vegetables, she may not be getting in enough potassium which can cause muscle cramps.
bananas and orange juice have a lot of potassium which can help her not have muscle cramps.
is she willing to drink orange juice and eat bananas?
that could help
let me know if you have other questions.
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