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But what they have been able to observe so far is that people eating vegan diets tend not to be overweight if anything, some are very thin and may have problems in older age when weight loss becomes an issue

Clinical presentation and metabolic consequences in 40 breastfed infants with nutritional vitamin B 12 deficiency--what have we learned

B Vitamins and the Brain: Mechanisms, Dose and Efficacy A Review

National Academies Press

Overproduction of Haptocorrin Finally, some cases show the over production of other molecules which also bond to vitamin B12, most commonly the so-called haptocorrin or R-binder, to which transcobalamin I and III belong