• Most animals produce vitamin 'D' and vitamin 'C' within their own systems. We "naked apes" got the short end of that adaptation mechanism. We have to have sun on the skin or foods that have 'D' in abundance, which is, interestingly, sea food. There are others in the plant world, but it takes a great deal of those plants to provide adequate amounts for good bone growth in children. Humans may have become "hairless" primates because of the need for 'D' that their primarily meat diet did not provide when they went out onto the savannahs and became hunters.
  • Maybe it's in something they eat..I have to take a D vitamin all year long. Maybe they don't even need it, it's for your bones so they might not ever have to worry about thinning bones.
  • By eating other animals that work the day shift yo...
  • they get sunlight that gets bounced off the moon.
  • In contrast to humans and primates, cathelicidin expression is not vitamin-D-regulated in rodents [27]. This is explained by their nocturnal life, which precluded evolution from taking benefit from the biological effects of sunlight [11]. Interestingly, in cats (other nocturnal animals), cutaneous 7-dehydrocholesterol 7-reductase activity (converting 7-dehydrocholesterol into cholesterol) was shown to be so high that the 7-dehydrocholesterol levels in the skin were insufficient to allow vitamin D3 photosynthesis [28]. Therefore, cats depend on their diet for their vitamin D supply (making vitamin D a true vitamin in these animals). That the ability for cutaneous photoproduction of vitamin D seemingly paralleled the evolution of cathelicidin to vitamin D regulation might suggest a link between these 2 events. Siegfried S., Simonary, T. 2008. The Epidermal Vitamin D System and Innate Immunity: Some More Light Shed on This Unique Photoendocrine System? Dermatology. Vol. 217. 7-11.
  • 'It is quite possible that nocturnal, free-ranging bats that have no known dietary source of vitamin D have evolved to also absorb intestinal calcium independent of vitamin D. Indeed, Keegan et al. found that the small intestine of R. aegyptiacus was freely permeable to calcium in both directions indicating a vitamin D-independent process. It is also possible that a currently unknown source of dietary vitamin D is available to free-ranging animals as has been suggested by others.' Source: 'Effects of sunlight on behavior and 25-hydroxyvitamin D levels in two species of Old World fruit bats' ------- ------

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