I believe that they try to, but I have serious doubts about how effective it is. Dietary science is littered with examples of incorrect guidance driven by data we misinterpreted. Remember when a generation of people were told to eat low fat and they all got fatter? Remember trans fats replacing saturated? Remember when we told everyone that drinking alcohol in moderation was healthier than not drinking at all?
Most dietary studies are observational, which means there is no control group and no blinding. It’s a deep dive into data (largely self-reported) with an attempt to control the endless variables by slicing and dicing the data to hopefully end up with groups that can be meaningfully compared.
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I believe that they try to, but I have serious doubts about how effective it is. Dietary science is littered with examples of incorrect guidance driven by data we misinterpreted. Remember when a generation of people were told to eat low fat and they all got fatter? Remember trans fats replacing saturated? Remember when we told everyone that drinking alcohol in moderation was healthier than not drinking at all?
Most dietary studies are observational, which means there is no control group and no blinding. It’s a deep dive into data (largely self-reported) with an attempt to control the endless variables by slicing and dicing the data to hopefully end up with groups that can be meaningfully compared.