Helps use body fat as a source of energy
Each of these involves different mechanisms, different prognoses, and different treatment approaches, which is why understanding which type you are dealing with matters enormously for your safety and treatment planning
Deficiency In healthy adults, overt vitamin B 12 deficiency is uncommon, mainly because total body stores can exceed 2,500 g, daily turnover is slow, and dietary intake of only 2.4 g/day is sufficient to maintain adequate vitamin B 12 status (see The RDA) (4)
Int J Mol Sci 22:1 Germain A, Ruppert D, Levine SM, Hanson MR (2017) Metabolic profiling of a myalgic encephalomyelitis/chronic fatigue syndrome discovery cohort reveals disturbances in fatty acid and lipid metabolism