Why Are Taller People at Greater Risk for Cancer? There have been studies in the past that said taller people were at greater risk for cancer because of various reasons. A new study concludes a simple theory. The research says taller people just have more cells. That means there is more of a chance of something to go wrong. An increased risk for taller people was seen in 18 of 23 cancers that were studied. Who is the tallest person you know? Do you think tall people should worry about this new research?