I've looked into the work of Dr. Mosley on several occasions and we sometimes will see UK programs on the PBS channels here. I think he managed that delicate balance of "popular" yet still credible.

From the New York Times
British TV Doctor Michael Mosley Found Dead in Greece
Dr. Mosley, a British medical journalist and documentary maker, disappeared last week while on a trip on the Greek island of Symi.

Dr. Mosley, 67, a BBC journalist, had arrived on Tuesday on Symi, part of the Dodecanese islands in the Aegean Sea, for a weeklong trip. He told friends at Agios Nikolaos beach on Wednesday afternoon that he would walk back to his accommodation in Symi town, the local authorities said.

The walk is about two miles, depending on the route taken. When hours had passed with no sign of Dr. Mosley, his wife, Clare Bailey Mosley, reported him missing to the police.

Further down the article:

Over the years, many British viewers relied on Dr. Mosley, a longtime investigator of science and health, for his myth-busting advice on diet, exercise and sleep. Trained as a doctor before venturing into television, Dr. Mosley hosted the popular BBC health podcast “Just One Thing” and appeared on the show “Trust Me, I’m A Doctor.”

He produced a variety of health and science programs for the broadcaster, and often offered himself up for experimentation in the documentaries he presented. He swallowed parasites and trialed magic mushrooms, but he was most widely known for popularizing the 5:2 diet, a form of intermittent fasting that involves five days of normal eating and two days of fasting each week.

He was nominated in 2002 for an Emmy for “The Human Face,” a series examining the science behind beauty.

More recently, he had released two series with the British Channel 4 broadcaster investigating obesity in Britain and the nutrition behind the grocery shopping of everyday consumers. He had toured Britain this year with his wife, also a doctor and health columnist, with an interactive live show focused on healthy living.