Cellular HealthIGF-1 (Insulin-like Growth Factor 1)A growth-promoting hormone stimulated by protein and calories. It falls during fasting and protein restriction, and that reduction is a focus of longevity research. Related Terms Growth Hormone (HGH)METABOLISM AMPKCELLULAR HEALTH ApoptosisCELLULAR HEALTH AutophagyCELLULAR HEALTH