If you can't get through your morning without a cup of coffee or two, it may be in your genes, according to recent research.

According to the study's findings, the way your body reacts to caffeine may be determined by a handful of genetic variants, six to be exact, according to a report at sciencedaily.com. Apparently, the differences help determine who likes and doesn't like coffee and how the caffeine will affect each person's body.

So, if you wake up each day craving as much coffee as you can possibly get your hands on, you can blame science. As for the traffic, that's a completely different study.