Carnitine deficiencies lead to disrupted metabolic cycles and problems with the heart muscle
In the context of GH and IGF-I physiology it can be concluded that 1) during childhood and adolescence the combined actions of GH and IGF-I in the presence of sufficient nutrition promote longitudinal growth and somatic maturation, 2) continued excess IGF-I activity in adulthood increases the risk for cardiovascular and neoplastic diseases and hence reduces longevity, 3) calorie restriction, which suppresses IGF-I activity and stimulates GH secretion, may promote longevity in human adults (82)
While insulin and IGF-1 share structural similarities and activate overlapping intracellular signaling pathways, such as the PI3K/Akt and MAPK pathways, they exhibit differential localization within the brain, which may impact their distinct roles in neuronal function and mood regulation [94, 95]
Nakano T, Hsu LW, Lai CY, Takaoka Y, Inomata M, Kitano S, et al