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by charsifood 3231 days ago
Caffeine increases excretion of calcium and magnesium [1]. This is why some caffeine pills are pressed with ~75mg calcium.

Muscle tremors could be a sign of magnesium and/or calcium deficiency, so it's likely that you were losing too many minerals and not making up for it in your diet.

[1] https://www.ncbi.nlm.nih.gov/pubmed/7836625