<p>➀ Researchers at the University of New Mexico have found that oxalic acid, a compound found in many foods, can produce gadolinium nanoparticles in human tissues; </p><p>➁ Gadolinium is a rare-earth metal used in MRI scans, and its contrast agents are administered to enhance image clarity; </p><p>➂ The study suggests that oxalic acid may play a role in the formation of nanoparticles that lead to health issues in kidneys and other organs.</p>