We don't hold onto water like we used to...I'd say it's more likely to be dehydration...your electrolytes might be off. That causes muscle contractions in my calves. I supplement with magnesium & calcium (250 mg. each), plus salt my food just under my bloat threshold. If you are not eating salmon, avocados, mushrooms and dark leafy greens (and obviously fruit) then you are probably low in potassium, too. DV is 3,500 mg. Higher than you would think.