There's a term for this that I learned recently for this but I'm blanking on it. It has to do with a growing strategy of looking at 2 groups when trying to solv

There's a term for this that I learned recently for this but I'm blanking on it. It has to do with a growing strategy of looking at 2 groups when trying to solve a medical problem. And, rather than find a cure for the problem, they look for differences in the populations that prevents the problem from one of them. The story I heard that sort of started the movement had to do with international doctors who had volunteered to be part of a childhood malnutrition treatment for some south east asian country. When they got there, the promised monetary support was not there, and they were only given a car and a driver. So they drove around to see if there was anything they could do to help the children without the vitamin shots they thought they were going to administer and noticed there were families whose children weren't malnourished. It turned out their parents, while they were out weeding their rice fields, were grabbing foodstuff that was considered culturally undesirable. Certain weeds and other things that lived in the fields. Then they'd add what they gathered to their meals. The doctors then made it an education mission, rather than a medicine dispersion mission. It sounds stupidly simple in retrospect, but I don't think they came by the solution easily. Like, if the food was undesirable, parents may have been very hesitant to disclose they were eating it, let alone feeding it to their children.