Potassium and sodium out of balance.  Too little potassium and too much sodium is bad for the heart and general health.
D002319:Cardiovascular System; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000503:physiopathology*; D007008:Hypokalemia / Q000097:blood* / Q000175:diagnosis; D009752:Nutritional Status; D017419:Potassium, Dietary / Q000097:blood*; D012982:Sodium, Dietary / Q000097:blood*
D017419:Potassium, Dietary; D012982:Sodium, Dietary