[quantified]

Not at all. Adequate science would tease out all the suitable variables for each individual’s diet at any time and situation for their stage of life. Which will include the details of current internal biome, current infections, medical history of their digestive and other organ systems, metabolism cycles, and many more things. And for which outcome where outcomes compete: cancer likelihood, bone health, sperm count, mental dexterity, fat content, etc.

The fact that there are too many variables and that it’s overly challenging to adequately measure them, coupled with challenges in studying people (ethics, self-assessment blind spots, laws against various options) makes nutrituon a squishy science, neither soft (people stuff like economics or psych) nor hard.

[h2odragon]

Like weather forecasting but worse. Nicely put. "oobleck science" on this continuum perhaps.