Fasting and oral glucose-stimulated levels of glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) are highly familial traits
It can cause low energy, cognitive problems, and even mimic dementia
According to research published in the Journal of Clinical Endocrinology & Metabolism , growth hormone secretion declines by approximately 14% per decade after age 30, contributing to many age-related changes in body composition and energy levels
These include a relative or absolute increase in glucagon secretion from alpha cells of the pancreas, elevated serum free fatty-acid concentrations, an impaired incretin effect (e.g., decreased secretion of glucagon-like peptide-1 [GLP-1]), enhanced renal reabsorption of glucose, and dysregulation of appetite control via decreased neurotransmitter response in the brain
Studies in aged rats show that mitochondrial membrane potential, cardiolipin content, respiratory control ratio, and cellular oxygen uptake are significantly reduced compared to young animals, while oxidative stress markers are elevated
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