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B12 supports red blood cell production and normal energy metabolism, so correcting a deficiency can help recovery

thus breaking down the fat

Ultimately, if you notice your normally brown stool appearing yellow for more than one day in a row, it's best to contact your doctor for advice as this could be an indication of an underlying health condition

doi: 10.1139/y82-201
The trouble is that the IFA test is not entirely reliable, it has a very low sensitivity and misses many that do have PA

Thiamine and pyridoxine deficiency: new insights into clinical disorders
