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2b, c), suggesting a potentially significant physiological role of cholesterol in ghrelin signaling

a third paper carries a 2021 Expression of Concern

doi: 10.3390/cancers12010013 66 NakamizoAMiyamatsuYHiroseHAmanoTMatsuoSFujiwaraMet al

Ketone bodies may also provide neural benefits to younger individuals and those not yet in a hypometabolic state, as ketones increase Gibbs free energy exchange for ATP by 27% compared to glucose, potentially representing a more efficient fuel for the brain [21,27]

Ipamorelin mimics ghrelin and binds to the ghrelin receptor (or GH secretagogue receptor, GHSR) in the brain, thereby selectively stimulating the release of GH from the pituitary gland