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As we know, there is a lot of ridiculous pseudoscience out there. That 1971 paper seems to reference a downregulation of sensitivity, (which happens in many body systems), but notes that glucose tolerance tests are still similar. Type II diabetes is Genetic, (the genetic penetrance much more so than in Type I) Unfortunately diet modification can only help with Type II for so long. Conversely, all those people who are told that ‘sweet food will give them diabetes’, not the case if they dont have the type II gene.
Dolphins have blow holes, theyre mamals right?