Gastrointestinal effects (nausea, diarrhea) are common initially
That means eating foods that are rich in animal proteins, which are the main source for B12: Vegans and vegetarians who dont eat animal products may include a B12 supplement in their diet
therefore, nutritional deficiency of this vitamin is rare in adults in the absence of malabsorption disorders
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2013 Mar Merav Jacobson Bensky, Irit Ayalon-Dangur, Roi Ayalon-Dangur, Eviatar Naamany, Anat Gafter-Gvili, Gideon Koren, Shachaf Shiber
This could include periodic blood tests, reviews of blood sugar logs, and assessments of weight loss progress