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Thermogenesis. ... The increase in energy expenditure caused by feeding is known as
diet-induced thermogenesis or the thermic effect of feeding (Van Zant, 1992). ...
... Ephedra and caffeine causes weight loss by decreasing appetite which is 70-80% of
the total weight loss and increasing thermogenesis which is when the core ...
... brain barrier [23]. Leptin acts on the brain to inhibit feeding, increase
thermogenesis, and decrease body weight [24]. There is ...
... caffeine. It is thought by some that weight loss and thermogenesis can be
attributed to the caffeine found naturally in green tea. ...
... be considered as contributing to causation are: heredity, overeating, altered
metabolism of adipose tissue, defective or decreased thermogenesis (the process ...
Submitted by conejo on September 21, 2007
Category: Science
Words: 1636 | Pages: 7
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The Thermic Effect of Feeding Medium Chain Triglycerides
Even during rest the human body is constantly metabolizing energy to maintain itself. The rate at which energy is expended by the body, expressed in calories per hour, or normalized to calories expended per kg body mass per hour, is known as the metabolic rate. The basal metabolic rate (BMR) is the body’s rate of energy expenditure while at rest. This represents the energy requirements of maintaining life, consisting mostly of maintenance of body temperature, heart rate, breathing, nerve transmission, and electrochemical gradients across cell membranes. The basal metabolic rate accounts for 65-75% of daily energy requirements (Van Zant, 1992). Other components of metabolic rate include the thermic effect of feeding (TEF; also referred to as diet-induced thermogenesis, or DIT), the thermic effect of activity (TEA), and adaptive thermogenesis (AT); Van Zant (1992). Metabolic rate is affected by many parameters such as eating (caloric consumption as well as dietary composition), activity (dependent on type, intensity, and duration of activity), lean body mass, age, sex, hormones, and drugs.
Since all of the energy expended by the body is ultimately converted to heat, except when work is performed outside the body, metabolic rate can be determined by the amount of heat energy liberated by the body (Guyton, 1976). A calorimeter can be used to directly measure the heat given off by the body. However, since greater than 95% of the energy liberated by the body is derived from the reaction of foods with oxygen, the metabolic rate can also be calculated from the rate of oxygen consumption (Guyton, 1976). In many studies metabolic rate, or energy expenditure, is expressed in terms of oxygen consumption.
After consuming a meal the food is digested, released into the bloodstream, and transported to all the cells of the body. There, it reacts...
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