Curiosity, you’re using quotation marks, but in fact I didn’t say anything about “validating” Rambam’s science. I just added some tentative personal comments.
Do you think following all of Rambam’s health advice is actually required? If not, then why not discuss whether they are in fact healthy? In general, we are not required to believe that the rishonim never erred in scientific matters (after all, dozens of rishonim, including Ramam’s son Rabbeinu Avraham, believed Chazal could err in science because they limited by the scientific knowledge of their times).
I agree with Reb Doniel that much of Rambam’s health advice is sound and we should take it seriously, but that doesn’t mean we shouldn’t compare it to modern scientific knowledge. Interestingly, people have noted several parallels between Rambam’s health advice and Chinese medicine.