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When this program is used with a very low calorie diet, the user should see consistent weight loss results

Being a vegetarian or vegan : This group consumes less foods that are naturally high in vitamin B12, such as beef and poultry (and sometimes dairy and fish too), which means their intake of vitamin B12 is lower whether their absorption is adequate or not

Efficacy and Safety of Semaglutide for Weight Loss in Obesity Without Diabetes: A Systematic Review and Meta-Analysis

[64] Ibid [65] Alleyne M, Horne MK, Miller JL

Other risk factors include certain gastrointestinal conditions, autoimmune conditions such as pernicious anaemia, long-term use of some medications, and increasing age