From what I've read you'd normally get sufficient electrolytes in your diet. Almost all foods have multiple electrolytes. About the only way to check if you're deficient or over the limit in any of them would be by a blood test - and even then I don't know if it only gives a point value or if it can give you an overall general indication of over or under in the medium term.I am basically on a low calorie diet and I wondered if palpitations, hypotension and tachycardia can be because of that. I am discussing with my GP and will be doing some blood tests.