Gluconeogenesis: When diet is deficient incarbohydrates. Glucose or glycogen is formed from noncarbohydrate compounds principally from certain amino acids and the glycerol of triglycerides. This is called gluconeogenesis. It also occur mainly in the living organism. Its importance lies more in the fact that certain vital parts of body such as muscles, nervous tissue, RBC lactating mammary glands,etc. Hormones promote, but insulin inhibits gluconeogensis.