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"If you've never heard it before, regardless how old it is, it's new." - Harry S. Truman

The classic clinical work on nutrition and dental decay was conducted mainly in the 1920’s and 30’s. This was in many ways the “Age of Nutrition”.  Deficiency diseases were being identified and scourges such as scurvy (vitamin C), beriberi (vitamin B1), pellagra (vitamin B3), and rickets (vitamin D) were being successfully cured through diet and nutrition. Medical research was strongly focused on nutrition.
Today the situation is very different. For the last few decades, we have been in an “Age of Pharmaceuticals”. Medical practice and research is now heavily, almost exclusively, invested in drug treatments.  Medical doctors and dentists receive little training in nutrition, and often the claim is made that “there is no scientific proof that such and such diet treatment is effective”. This may be true, because the nutritional studies are rarely being done. Certainly, there is no incentive for drug companies to fund nutritional studies because they are not able to patent and profit from effective diet therapies.
Even if funding were available today, it would not be possible to conduct the same controlled studies that Dr May Mellanby and others performed in the 20’s and 30’s. Those studies took place in institutions such as orphanages, hospitals and “unwed mothers” homes, where diets could be exactly controlled. Today such institutions are rare, and it is unlikely that ethics committees would approve many of the earlier experimental designs.
Just because a study was performed decades ago does not invalidate the results.

Quality scientific research always stands the test of time.