CRH: corticotrophin releasing hormone; ACTH: adrenocorticotropic hormone
GH-IGF-1 axis: growth hormone- insulin like growth factor-1 axis
GHBP: GH binding protein
GLP-1: glucagon like peptide-1; GIP: glucose-dependent insulinotropic peptide
HPG axis: hypothalamic-pituitary-gonadal axis
HPA axis: hypothalamic-pituitary-adrenal axis
HPT axis: hypothalamic-pituitary-thyroid axis
LH: luteinizing hormone
PYY: peptide YY
T3: tri-iodothyronine; T4: tetra-iodothyronine; TSH: thyroid stimulating hormone