As most dieters know, a slow or inefficient metabolism can sabotage even the most disciplined of weight loss plans. According to NewLeaf.com, metabolism is a complex process in which the body accesses the energy contained in the chemical bonds of nutrients and converts it into phosphate bonds, which are in turn used by the body for various processes. Although physical exercise is still the most time-tested means of boosting metabolism, there is also evidence that some herbs can assist in this function.
Guarana Extract
Guarana extract is an herb culled from a climbing vine of the same name. According to RaintreeNutrition.com, guarana contains a high concentration of caffeine, at least double that of coffee beans. It acts as a central nervous system stimulant, and is thought to increase the body's conversion of calories into heat, a process known as thermogenesis. Guarana also acts as a diuretic, prompting water weight loss through increased urination. Due to its caffeine content, it also is used to increase energy and stamina.
Green Tea
Green tea extract has become popular for a wide variety of health uses, weight loss among them. According to VitaminsToHealth.com, green tea also promotes thermogenesis, and is thought to increase the rate of this process by 3 percent to 4 percent. It also contains components known as cachetin polyphenols, which maximize the body's use of norepinephrine, a neurotransmitter actively involved in calorie burning. Green tea's caffeine content may provide a mild energy boost, but it is also available in decaffeinated form.
Bitter Orange
Bitter orange, also known as citrus aurantium or synephrine, is an herbal extract harvested from the fruit or peel of the bitter orange, also known as the Seville orange. It is a central nervous system stimulant and has been touted as an alternative to the banned herbal ingredient Ma huang, also known as ephedra. The Mayo Clinic cautions that because it increases heart rate and blood pressure, bitter orange may present serious health risks.
Kelp
Another means of addressing a slow metabolism is by stimulating the thyroid gland, which secretes hormones that play an important role in metabolism. Kelp, a kind of seaweed, has been shown to activate production of these hormones, according to VitaminsToHealth.com. Kelp also contains iodine, which is thought to increase the body's resting metabolism. For those who are sensitive to caffeine and other stimulants, natural thyroid boosters such as kelp may be preferable.
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