The following originally appeared on The Upshot (copyright 2018, The New York Times Company).

We know it can be hard to persuade physicians to do some things that have proven benefits, such as monitor blood pressure or keep patients on anticoagulants. But it might be even harder to get them to stop doing things.

In May, a systematic review in JAMA Pediatrics looked at the medical literature related to overuse in pediatric care published in 2016. The articles were ranked by the quality of methods; the magnitude of potential harm to patients from overuse; and the potential number of children that might be harmed.

In 2016 alone, studies were published that showed that we still recommend that children consume commercial rehydration drinks (like Pedialyte), which cost more, when their drink of choice would do. We give antidepressants to children too often. We induce deliveries too early, instead of waiting for labor to kick in naturally, which is associated with developmental issues in children born that way. We get X-rays of ankles looking for injuries we almost never find. And although there’s almost no evidence that hydrolyzed formulas do anything to prevent allergic or autoimmune disease, they’re still recommended in many guidelines.

Those researchers had reviewed the literature on overuse in children before, looking at all the studies from a year earlier. They modeled the work on a set of papers in JAMA Internal Medicine that looked at overuse in adults through a review of the literature published in 2015, 2014 and 2013.

Overuse is rampant. And it can harm patients.

By the end of the 20th century, for example, research seemed to indicate that we wanted to keep patients in the intensive care unit in a tight range of blood glucose levels. The evidence base for these recommendations came from observational studies that showed that patients with such tight control seemed less likely to develop adverse outcomes like infections or hyperglycemia, and they seemed more likely to survive.

Researchers tested this recommendation prospectively in a randomized controlled trial in a surgical intensive care unit. The results, published in 2001, appeared to confirm the prior findings, that tight glycemic control saved lives.

The study wasn’t perfect. It wasn’t blinded, for instance, and there were downsides to the recommendations. About 5 percent of those who received the intensive therapy had severe hypoglycemia at least once. The mortality in the control group was higher than what might be expected. Finally, this was a study of mostly post-cardiac surgery patients, and it wasn’t clear how widely the findings could be generalized.

Nevertheless, this was a huge benefit, and given the severity of the population being treated (intensive care patients are usually very, very ill), many experts called for changes in treatment while further research was done.

That larger work was published in 2009. The study randomly assigned more than 6,000 patients admitted to an intensive care unit for more than three days — to either tight or traditional glucose control. This time, there was a significantly higher rate of death in the tight control group (27.5 percent vs. 24.9 percent), as well as a much higher rate of severe hypoglycemia (6.8 percent vs. 0.5 percent). These findings applied to patients over all and to subgroups (like surgical versus medical patients).

In light of this, guidelines changed again. Physicians were asked to stop the widespread tight glycemic control.

In 2015, some enterprising researchers set out to look at how this knowledge changed physician behavior. Beginning in 2001, they looked at how physicians adopted the recommendations to use tight glycemic control in patients admitted to intensive care units. Starting in 2009, they looked at how physicians absorbed new information telling them to stop.