By Joe Smith Changes in how much you blink could be a sign of serious underlying health issues, according to health experts. Either blinking too much or in some cases too little, can be a telltale sign that you have any one of a number of health problems, from simple allergies to more serious conditions like autoimmune disorders and even Parkinson’s. Blinking helps to keep the eye moist and remove dust and debris, on average most human adults blink once every three to five seconds – but changes to this can indicate something else is going on. We list the seven conditions to look out for below….