The study concluded that in newborn rats, the activation of the c-Fos gene worked to increase body weight, while at more advanced ages the treatment led to a decrease in body weight and an increase in uncoupling protein 1
Key Preclinical Study (Neelakantan et al., 2018): Treatment in diet-induced obese mice produced progressive body weight loss, reduced white adipose tissue mass and adipocyte size, decreased total cholesterol, and no changes in food intake effects were metabolic, not appetite-driven
However, PA specifically refers to the clinical manifestation associated with IF deficiency and subsequent B 12 malabsorption
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For references and more information , see the section on Vitamin K in the Pregnancy and Lactation article
Does Vitamin B12 Directly Cause Weight Changes