1) Plant foods don't contain B12 any more due to commercially produced plant foods. Bacteria produces most of our vitamins and over the decades the soil has become depleted of many bacteria due to pesticides and fertilisers meaning that our plant foods are lower in vitamins than they were only 60 years ago. However, homegrown and organic produce can still obtain plenty of vitamins so definitely try and grow some of your own.
2) We wash our food. We are lead to think that washing our food will wash off any pesticide residues however this does little use as the food is completely full of the chemicals. In organic homegrown produce B12 clings near stems and in the past people would just eat the produce fresh from the ground, receiving their dose of B12.
3) It cannot be absorbed by the body. Meat eaters consume enough B12 but aren't always able to absorb it due to the lack of 'intrinsic factor' caused by too much fat in the diet and medication. Therefore, everybody is at risk of developing a deficiency.
Facts from 80/10/10 by Douglas Graham
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