Some of us love coffee and some love tea. But do you know that this choice of yours is connected to your genetic predisposition? Yes you have heard it right! This is so because bitterness acts as a natural warning system to safeguard us from those toxic substances. Reportedly the study carried out by researchers from US-based Northwestern University and QIMR Berghofer Medical Research Institute in Australia examined the reactions to three bitter substances -- caffeine quinine and propylthiouracil (PROP) -- to observe how they affect people's preference for drinking tea coffee and alcohol. The findings of the study revealed