Another article in a long line that discusses the challenges of producing knowledge about human health. Despite scientific methods, producing knowledge is extremely challenging.
“High-quality trials are hard to do because diets, and the behavior of humans who consume them, are so complicated. A single meal might have dozens of nutrients and hundreds of other bioactive substances that interact in unknown ways. Furthermore, if the diet being studied increases intake from one food category, people may eat less from other food categories, making it difficult to attribute results to any specific dietary component.”