The study, which appeared in the journal Neuroradiology, took place at the University Hospital Schleswig-Holstein in Germany with 30 participants, half of whom had the blood flow to their heads observed while wearing a tie, while the other half went tie-free. The ties actually squeezed the veins that allowed the blood to reach the brain. It cuts off circulation by 7.5%. You might not be acutely aware of this, but it’s a sizable percentage; enough to make a potentially fatal difference if you already have high blood pressure (I did some research on this: you’d have to have REALLY high blood pressure to have a tight tie be the catalyst for your demise).

Wearing a tie can also add unneeded pressure to your eyes, which could lead to an early onset of glaucoma. And if you’re still of the mindset that wearing a tie makes a difference in professionalism: according to a 2015 study, it only really makes a difference to the person wearing the tie.

(Source: https://bigthink.com/ned-dymoke/wearing-a-tie-cuts-circulation-to-your-brain/)