basal metabolic rate
Idle energy expenditure
Basal metabolic rate is the minimum energy your body expends at rest to maintain vital functions—breathing, circulation, cell production.
Usually measured in calories per day, it represents the baseline fuel requirement for staying alive without any physical activity.
Often abbreviated BMR, it varies with age, sex, weight, and genetics: Her basal metabolic rate dropped after turning forty.
Measures of food energy
- energy expenditurePower used by activity
- caloric needsBody's fuel demand
- deficitAmount still owed
- surplusAmount exceeding requirement
intake · burn · kcal · nutrition · diet · weight management · obesity · fasting
Hormone-producing neck gland
- hormonesBloodstream signaling molecules
- endocrineInternally secreting gland system
- insulinPancreatic glucose-regulating hormone
- cortisolAdrenal steroid regulating stress
leptin · ghrelin · adrenaline · homeostasis · thermoregulation · autonomic · circadian rhythm · parasympathetic
Cell's energy molecule
- mitochondriaCell's energy-producing organelles
- cellular respirationCell-level fuel burning
- glucosePrimary cellular fuel
- fatty acidsOrganic molecules in fats
amino acids · catabolism · anabolism · thermogenesis · bioenergetics · oxidation · proteins · carbohydrates
Rate of breathing gas
- body compositionBodily tissue proportions
- lean body massBody weight excluding fat
- kilocaloriesUnits measuring food energy
- gas exchangeTransfer of respiratory molecules
Recurring unconscious repose
- sedentaryCharacterized by much sitting
- breathingPulmonary gas exchange
- heart rateCardiac contractions per minute
- digestionBodily food breakdown
calories
Measures of food energy
- energy expenditurePower used by activity
- caloric needsBody's fuel demand
- deficitAmount still owed
surplus · intake · burn · kcal · nutrition · diet · weight management · obesity · fasting · hunger
thyroid
Hormone-producing neck gland
- hormonesBloodstream signaling molecules
- endocrineInternally secreting gland system
- insulinPancreatic glucose-regulating hormone
cortisol · leptin · ghrelin · adrenaline · homeostasis · thermoregulation · autonomic · circadian rhythm · parasympathetic · sympathetic
ATP
Cell's energy molecule
- mitochondriaCell's energy-producing organelles
- cellular respirationCell-level fuel burning
- glucosePrimary cellular fuel
fatty acids · amino acids · catabolism · anabolism · thermogenesis · bioenergetics · oxidation · proteins · carbohydrates · lipids
oxygen consumption
Rate of breathing gas
- body compositionBodily tissue proportions
- lean body massBody weight excluding fat
- kilocaloriesUnits measuring food energy
sleep
Recurring unconscious repose
- sedentaryCharacterized by much sitting
- breathingPulmonary gas exchange
- heart rateCardiac contractions per minute
digestion · supine · vital functions · unconscious processes · baseline
- metabolismcatabolism, anabolism, metabolism, glycolysis, citric acid cycle
- physiologymetabolism, circulation, respiration, homeostasis, digestion
- calorie trackingcalories, calorie counting, calorie deficit, calorie budget, calorie goal
- energy requirementscalories, caloric intake, BMR, daily intake, energy balance
- thermogenesisthermogenesis, body heat, brown fat, metabolism, BMR
- nutritionnutrients, protein, carbohydrates, fats, vitamins