Venca-Stastny/Getty Images Venca-Stastny/Getty Images A drug taken by millions of people to control diabetes may do more than lower blood sugar. Research suggests metformin has anti-inflammatory effects that could help protect against common age-related diseases including heart disease, cancer, and cognitive decline. Scientists who study the biology of aging have designed a clinical study, known as The TAME Trial, to test whether metformin can help prevent these diseases and promote a longer healthspan in healthy, older adults. Michael Cantor, an attorney, and his wife Shari Cantor, the mayor of West Hartford, Connecticut both take metformin. “I tell all my friends about it,” Michael Cantor says. “We all want to live a little longer, high-quality life if we can,” he says. Michael Cantor started on metformin about a decade ago when his weight and blood sugar were creeping up. Shari Cantor began taking metformin during the pandemic after she read that it may help protect against serious infections. Shari and Michael Cantor both take metformin. They are both in their mid-60s and say they feel healthy …