Buy Green Tea For Weight Loss
The present study was conducted to investigate whether green tea may improve weight maintenance by preventing or limiting weight regain after weight loss of 5 to 10 % in overweight and moderately obese subjects. The study had a randomised, parallel, placebo-controlled design. A total of 104 overweight and moderately obese male and female subjects (age 18-60 years; BMI 25-35 kg/m(2)) participated. The study consisted of a very-low-energy diet intervention (VLED; 2.1 MJ/d) of 4 weeks followed by a weight-maintenance period of 13 weeks in which the subjects received green tea or placebo. The green tea contained caffeine (104 mg/d) and catechins (573 mg/d, of which 323 mg was epigallocatechin gallate). Subjects lost 6.4 (sd 1.9) kg or 7.5 (sd 2.2) % of their original body weight during the VLED (P
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More recently, green tea has been linked to weight loss. This article will look at the evidence behind this claim, as well as the most effective methods of consuming green tea to help with weight loss.
A more recent review investigated the clinical use of green tea to stimulate weight loss in people who were overweight or obese. While it found green tea to have a positive impact on weight loss, the result was not significant, and the authors concluded that it was unlikely to be of clinical importance.
It is important to note that any benefits of green tea for weight loss are likely to be very small. The impact of green tea is not as beneficial as other healthy weight loss methods, such as exercise, that have far greater metabolic benefits.
Drinking between 2 and 3 cups of hot green tea throughout the day should be sufficient for supplementing weight loss. The exact amount will vary from person to person, depending on how much caffeine they consume and their natural metabolism.
Green tea comes in a number of varieties but, for weight loss, there are unlikely to be significant differences between them. Plain, minimally processed green teas are likely to have retained the richest nutritional content.
The evidence for many of these claims remains inconclusive, however. For example, a 2009 review of the research linking the consumption of green tea to the prevention of cancer was unable to find any strong evidence supporting the claim.
Green tea is rich in nutrients and antioxidants that may have a range of health benefits. Further research will be required to determine the extent to which it may help with weight loss and the best method for its consumption.
This fact sheet provides information on weight-loss dietary supplements*, including summaries of research on the safety and efficacy of several of the most commonly used ingredients in these products.
More than two-third of adults and almost one-third of children and adolescents in the United States are overweight or have obesity [1,2]. Forty-five percent of Americans who are overweight and 67% of those with obesity are trying to lose weight [3].
Approximately 15% of U.S. adults have used a weight-loss dietary supplement at some point in their lives; more women report use (21%) than men (10%) [8]. Americans spend about $2.1 billion a year on weight-loss dietary supplements in pill form (e.g., tablets, capsules, and softgels) [9], and one of the top 20 reasons why people take dietary supplements is to lose weight [10].
Dietary supplements promoted for weight loss encompass a wide variety of products and come in a variety of forms, including capsules, tablets, liquids, powders, and bars [11]. Manufacturers market these products with various claims, including that these products reduce macronutrient absorption, appetite, body fat, and weight and increase metabolism and thermogenesis. Weight-loss products can contain dozens of ingredients, and some contain more than 90 [11]. Common ingredients in these supplements include botanicals (herbs and other plant components), dietary fiber, caffeine, and minerals.
People who are considering using weight-loss supplements should talk with their health care provider to discuss these products' potential benefits and risks. This is especially important for those who have medical conditions, including high blood pressure, diabetes, and liver or heart disease. Yet, according to a large national survey, less than one-third of U.S. adults who use weight-loss dietary supplements discuss this use with a health care professional [8].
The U.S. Food and Drug Administration (FDA) regulates dietary supplements, including those promoted for weight loss [13]. Like other dietary supplements, weight-loss supplements differ from over-the-counter or prescription medications in that the FDA does not classify them as drugs. Unlike drugs, dietary supplements do not require premarket review or approval by the FDA. Supplement manufacturers are responsible for determining that their products are safe and their label claims are truthful and not misleading. If the FDA finds a supplement to be unsafe, it may take enforcement action to remove the product from the market or ask the manufacturer to recall the product. The FDA and the Federal Trade Commission can also take regulatory actions against manufacturers that make unsubstantiated weight-loss claims about their products. The FDA does not permit dietary supplements to contain pharmaceutical ingredients, and manufacturers may not promote dietary supplements to diagnose, treat, cure, or prevent any disease [13].
Table 1 briefly summarizes the findings discussed in more detail in this fact sheet on the safety and efficacy of the most common ingredients of weight-loss dietary supplements. These ingredients are listed and discussed in the table and text in alphabetical order. Dosage information is provided when it is available. However, because ingredients might not be standardized and many products contain proprietary blends of ingredients, the active compounds and their amounts might not be comparable among products [15].
African mango, or Irvingia gabonensis, is a fruit-bearing tree that is native to western and central Africa [16]. Irvingia gabonensis seed kernel extract has been proposed to promote weight loss by inhibiting adipogenesis, as demonstrated in vitro [17]. In addition, a proprietary extract of Irvingia gabonensis, IGOB131, reduces serum levels of leptin [18], a hormone that is positively correlated with body weight and percentage body fat [19]. IGOB131 might also reduce total cholesterol and low-density lipoprotein (LDL) levels [18].
Safety: Irvingia gabonensis extract appears to be well tolerated. No adverse effects have been found in rats at doses up to 2,500 mg/kg body weight per day [20], but its safety has not been rigorously studied in humans. Most reported adverse effects are mild, including headache, difficulty sleeping, flatulence and gas [19]. However, Irvingia gabonensis has been associated with renal failure in a patient with chronic kidney disease [21].
Efficacy: Several small human studies have examined whether bitter orange is effective for weight loss [30]. Interpreting the results of these studies is complicated by the fact that bitter orange is almost always combined with other ingredients in weight-loss supplements.
Several studies have correlated higher calcium intakes with lower body weight or less weight gain over time [57-61]. Two explanations have been proposed. First, high calcium intakes might reduce calcium concentrations in fat cells by decreasing the production of parathyroid hormone and the active form of vitamin D. Decreased intracellular calcium concentrations, in turn, might increase fat breakdown and discourage fat accumulation in these cells [59]. Second, calcium from food or supplements might bind to small amounts of dietary fat in the digestive tract and prevent absorption of this fat [59,62,63]. Dairy products, in particular, might contain additional components that have even greater effects on body weight than their calcium content alone would suggest [60,64-67]. For example, protein and other components of dairy products might modulate appetite-regulating hormones [61].
The authors of four reviews of published studies on the effects of calcium from supplements or dairy products on weight management reached similar conclusions [70-73]. These reviews include a 2009 evidence report from the Agency for Healthcare Research and Quality whose authors concluded that, overall, clinical trial results do not support an effect of calcium supplementation on weight [70]. In addition, a 2015 meta-analysis of 41 randomized controlled trials found no benefit of calcium supplementation or increased dairy food consumption for body weight or body fat [73]. A 2016 meta-analysis of 33 randomized trials and longitudinal studies lasting 12 weeks to 6 years found that calcium from foods or supplements had no overall effect on body weight [74]. However, in subgroup analyses, calcium did reduce body weight in some groups, including children, adolescents, adult men, premenopausal women, women older than 60, and people with normal BMI [74]. Overall, the results from clinical trials do not support a clear link between higher calcium intakes and lower body weight, prevention of weight gain, or weight loss.
Efficacy: Most research on capsaicin and other capsaicinoids focuses on their effects on energy intake and appetite, rather than body weight. A meta-analysis of eight randomized, placebo-controlled clinical trials evaluated the effects of capsaicinoids on ad libitum energy intake in a total of 191 participants who had a normal body weight or were moderately overweight [78]. Doses of capsaicinoids ranged from 0.2 mg in a single meal to 33 mg/day for 4 weeks (via chili powder, chili-containing foods, or chili capsules). Overall, consuming capsaicinoids significantly reduced energy intake by a mean of 74 kcal per meal; body weight was not assessed, so the impact of this calorie reduction on weight loss cannot be quantified. The authors noted that the results suggest that at least 2 mg capsaicinoids are needed to reduce calorie intake but that the studies were very heterogeneous. 041b061a72