I’ve known for some time that grains don’t work well for me. I was reading a Paleo Diet newsletter today and discovered another reason not to eat them. Apparently, they are associated with deficiency diseases.
Whole Grain Cereals and Vitamin D Metabolism
Nutritional scientists have known forever and a day that excessive consumption of whole grain cereals severely impairs vitamin D metabolism and can lead to the bone disease, rickets. In fact, as far back as 1918, before vitamin D was discovered, a scientist in England by the name of Mellanby routinely induced experimental rickets in puppies by feeding them an oat diet. Epidemiological studies of human populations consuming high levels of unleavened whole grain breads show vitamin D deficiency and rickets to be widespread[18-20]. A study of radio-labeled vitamin D in humans consuming 60g of wheat bran daily for 30 days clearly demonstrated an enhanced elimination of vitamin D in the intestines.
16. Cordain L. Cereal grains: humanity’s double edged sword. World Rev Nutr Diet 1999; 84:19-73.
17. Mellanby E. The part played by an “accessory factor” in the production of experimental rickets. J Physiol (London) 1918;52:11-14.
18. Gibson RS, Bindra GS, Nizan P, Draper HH: The vitamin D status of east Indian Punjabi immigrants to Canada. Brit J Nutr 1987; 58:23-29.
19. Brooke OG, Brown IRF, Cleeve HJW: Observations of the vitamin D state of pregnant Asian women in London. Brit J Obstet Gynaecol 1981;88:18-26.
20. Hunt SP, O’Riordan JLH, Windo J, Truswell AS: Vitamin D status in different subgroups of British Asians. Br Med J 1976;2:1351-54.
21. Batchelor AJ, Compston JE: Reduced plasma half-life of radio-labeled 25-hydroxyvitamin D3 in subjects receiving a high fiber diet. Brit J Nutr 1983;49:213-16.