To help you navigate the clinical and biochemical explanations throughout the HimZen articles, we have compiled a glossary defining the essential terms of nutritional science and metabolic health.
Adenosine Triphosphate (ATP)
The universal energy currency of the cell. ATP stores chemical energy in its phosphate bonds, which cells break to power biological work (muscle contraction, nerve signaling, cellular repair).
Anabolism
The metabolic pathway that constructs complex molecules from simpler ones (e.g., building muscle tissue from amino acids, or storing glucose as glycogen). Anabolic processes require energy input.
AutophagyautophagyThe cellular process of recycling damaged components, clean-up, and cellular waste removal.
A highly regulated cellular cleanup process where cells degrade and recycle their own damaged proteins, worn-out organelles (like old mitochondria), and intracellular pathogens. Stimulated by fasting and low insulin.
BioavailabilitybioavailabilityThe proportion of an ingested nutrient or compound that enters the circulation to reach active targets.
The degree and rate at which a consumed nutrient is absorbed from the digestive tract and successfully utilized by the body's tissues.
Catabolism
The metabolic pathway that breaks down complex molecules into simpler ones (e.g., breaking down stored body fat into fatty acids to be burned). Catabolic processes release energy.
Chronobiology
The scientific field that studies biological rhythms and internal clocks in living organisms, specifically how these rhythms coordinate hormone release and metabolic pathways.
De Novo Lipogenesis (DNL)
The metabolic pathway by which the liver converts excess circulating carbohydrates (glucose and fructose) into fatty acids, which are then stored as body fat.
DIAAS (Digestible Indispensable Amino Acid Score)
The modern, gold-standard method for evaluating dietary protein quality, based on the digestibility of essential amino acids in the small intestine.
Eicosanoids
Short-lived local signaling molecules (prostaglandins, leukotrienes) synthesized from cell membrane fatty acids that regulate inflammation, blood flow, and pain sensitivity.
Ferritin
A large, intracellular protein complex that acts as a secure storage vault for iron, holding up to 4,500 iron atoms safely inside its structure to prevent oxidative damage.
Gluconeogenesis
The metabolic pathway by which the liver manufactures new glucose from non-carbohydrate precursors, such as amino acids, lactate, and glycerol. Activated during fasting or low-carbohydrate eating.
Glycation
A non-enzymatic chemical reaction where glucose or fructose molecules bind to proteins or lipids in the blood or tissues, creating damaging compounds (Advanced Glycation End-products, or AGEs) that cause vascular inflammation.
Glycogen
The storage form of carbohydrates in animals, made of highly branched chains of glucose. Stored primarily in the skeletal muscles (to fuel exercise) and the liver (to regulate blood sugar).
Glycemic Load (GL)
A metric that estimates the actual post-meal blood sugar impact of a food by multiplying its Glycemic Index by the total amount of carbohydrates in a standard serving size.
Hepcidin
A hormone produced by the liver that acts as the master regulator of systemic iron levels, controlling the absorption of iron from the gut and its release from storage vaults.
Hormone-Sensitive Lipase (HSL)
An enzyme inside fat cells responsible for breaking down stored triglycerides into free fatty acids so they can be released into the blood and burned for fuel. Strongly suppressed by even small amounts of insulin.
Hyperinsulinemia
A clinical state characterized by abnormally high levels of insulin circulating in the blood, often occurring as a compensatory mechanism to overcome insulin resistance.
Insulin Resistance
A physiological state where body cells (muscle, liver, fat) become less responsive to the insulin signal, requiring the pancreas to produce larger amounts of insulin to clear glucose from the bloodstream.
Lipolysis
The metabolic breakdown of stored lipids (triglycerides) into free fatty acids and glycerol, allowing stored body fat to be used as fuel.
Metabolic Flexibility
The cellular ability to smoothly and efficiently transition between burning carbohydrates (glucose) when fed, and burning fat (fatty acids) when fasting or resting.
mTORmtormammalian Target of Rapamycin; a nutrient-sensing protein pathway that regulates cell growth, muscle building, and protein synthesis. (mammalian target of rapamycin)
A major intracellular protein kinase pathway that acts as the cell's master nutrient sensor, triggering protein synthesis and cellular growth when amino acids (especially leucine) and energy are present.
Non-Exercise Activity Thermogenesis (NEAT)
The energy expended for everything we do that is not sleeping, eating, or sports-like exercise (e.g., walking, fidgeting, maintaining posture).
Randle Cycle (Glucose-Fatty Acid Cycle)
A biochemical mechanism describing the competition between glucose and fatty acids for oxidation pathways inside the mitochondria, where the burning of one fuel actively suppresses the processing of the other.
Sarcopenia
The age-related progressive loss of skeletal muscle mass, strength, and function, driven in part by anabolic resistance.
SCFA (Short-Chain Fatty Acids)
Metabolically active compounds (acetate, propionate, butyrate) produced by beneficial gut bacteria when they ferment prebiotic fibers in the large intestine.
Disclaimer: This glossary is for educational purposes only. Definitions are simplified to support general understanding of human biochemistry and metabolic pathways. Always refer to primary medical literature or consult healthcare professionals for clinical diagnostic guidance.
⚠️ Educational Disclaimer
This content is for educational purposes only. Natural compounds can interact with medications and underlying conditions. Consult a healthcare professional before making changes to your wellness routine.
HimZen Editorial
The HimZen editorial team compiles and synthesizes publicly available wellness research. We analyze data and outline key pros and cons to help you compare options and make better wellness decisions.