A new study has found that feeding fructose to lab animals with cancer caused their tumors to grow faster. However, the tumors did not directly consume the fructose. Instead, researchers discovered that the liver converted fructose into a type of fat that the cancer cells readily absorbed. This finding sheds light on the potential link between high-fructose diets and tumor growth, an association that has long been suspected but not fully understood. The study, funded by the NIH and published in Nature on December 4, suggests that the liver plays a key role in fueling tumors by transforming fructose into lipids.