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Two distinct neuron populations in the arcuate nucleus, namely orexigenic (appetite promoters) and anorexigenic (appetite suppressers), control food intake by responding to metabolic hormones (e.g., leptin, insulin, and ghrelin) and nutrients (Dimitri, 2022)

10.1016/j.expneurol.2011.10.021 Exp

BPC-157 and TB-500 also play a role by modulating the immune response

Additionally, Clostridium sporogenes upregulate colonic IL-22 and promote Foxp3 + Treg proliferation via metabolites (indole-3-propionic acid, etc.) in a non-butyrate-dependent manner (108)

[5] Notably, normal feedback mechanisms remain intact: elevated IGF-1 and GH can signal the hypothalamus and pituitary to modulate further hormone release, which may reduce the risk of extreme hormone levels