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Signals from the gut influence appetite, satiety, and energy balance through: The vagus nerve Hormonal signaling Microbial metabolites Key metabolic hormones produced or influenced by the gut include: GLP-1 (glucagon-like peptide-1) enhances insulin secretion and promotes satiety Peptide YY (PYY) signals fullness Ghrelin stimulates hunger When gut health is disrupted, these signals can become dysregulated, potentially contributing to overeating or impaired metabolic control

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Unlike oral supplements, injections bypass the digestive system for faster and more efficient absorption

Having said, that, Vitamin B12 is also not a standalone solution for people who are obese, and there are reasons to support this theory