It's official: With a portion of your own poop you can complete the 'skinny vegan diet'

[...]Ultimately, animals must obtain vitamin B₁₂ directly or indirectly from bacteria, and these bacteria may inhabit a section of the gut which is posterior to the section where B₁₂ is absorbed. Thus, herbivorous animals must either obtain B₁₂ from bacteria in their rumens, or (if fermenting plant material in the hindgut) by reingestion of cecotrope fæces.[...]http://en.wikipedia.org/wiki/Vitamin_B12

 Bon appetit!

http://en.wikipedia.org/wiki/Veganism