Age Related Decline of Polyamine (IMAGE) Cell Press Caption This graphic depicts how aging associated decline in polyamine levels lead to a correspondingly longer circadian period, which can be reversed by dietary polyamine supplementation. Credit Zwighaft et al./<i>Cell Metabolism</i> 2015 Usage Restrictions Credit Required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.