July 14 (UPI) -- Cancer deaths linked to obesity more than tripled in the United States during the past two decades, a new study says. Deaths linked to the 13 types of obesity-related cancer rose to 13.5 deaths per million from 3.7 deaths per million between 1999 and 2020, researchers reported Sunday at the Endocrine Society's annual meeting in San Francisco. "Obesity is a significant risk factor for multiple cancers, contributing to significant mortality," said lead researcher Dr. Faizan Ahmed