No, it’s totally broken. Typical nutritional studies take a large group of people, ask them what they normally eat, and look for correlation with whatever health problems that have. This can’t possibly work because most people’s diets have been influenced by whatever crap they have read about nutrition over the years.
Or they use animal models, animals whose natural diet looks nothing like a human diet.
The only way to really know how diet affects health is to take a large group of people, assign them different diets, see that they actually follow them, then measure the outcomes. But practically nobody does this because it is really expensive to do.
Or they use animal models, animals whose natural diet looks nothing like a human diet.
The only way to really know how diet affects health is to take a large group of people, assign them different diets, see that they actually follow them, then measure the outcomes. But practically nobody does this because it is really expensive to do.