One of the more common diet pill ingredients, green tea is actually a really good ingredient. Known for its fat-buring ability, it has become popular as of late and for good reason. This green tea review will delve into the ingredient to show why it is such diet pill companies use it so often.
The claims of green teas health benefits go far and wide, but we’ll focus on its potential as a weight loss supplement. One of the reason’s green tea is so effective is because it contains caffeine, another great weight loss ingredient. Green tea has about a fourth of the amountof caffeine found in a regular cup of coffee, with its caffeine being comprised of theophyline and theobromine.
Green tea has been the subject of many clinical studies, the vast majority of which have supported its claims to aid in weight loss. We’ll cover a couple of those studies here. One study found the following:
“In a randomized double blind, placebo-controlled, cross-over pilot study, six overweight men were given 300 mg EGCG/d for 2d. Fasting and postprandial changes in energy expenditure (EE) and substrate oxidation were assessed. RESULTS: Resting EE did not differ significantly between EGCG and placebo treatments, although during the first postprandial monitoring phase, respiratory quotient (RQ) values were significantly lower with EGCG compared to the placebo. CONCLUSIONS: These findings suggest that EGCG alone has the potential to increase fat oxidation in men and may thereby contribute to the anti-obesity effects of green tea. However, more studies with a greater sample size and a broader range of age and BMI are needed to define the optimum dose.” ((J Am Coll Nutr. 2007 Aug;26(4):389S-395S))
Note that the above mentioned EGCG (epigallocatechin gallate) is contained in green tea. Another study was also supportive:
“This study was undertaken to investigate the effects of green tea on weight reduction in obese Thais. A randomized, controlled trial involving 60 obese subjects (body mass index, BMI > 25kg/m(2)) was conducted. All subjects consumed a Thai diet containing 3 meals (8373.6kJ/day) for 12weeks, prepared by the Nutritional Unit at Srinagarind Hospital. The diet contained 65% carbohydrates, 15% protein, and 20% fat. Body weight, BMI, body composition, resting energy expenditure, and substrate oxidation were measured at baseline, and during weeks 4, 8, and 12 of the study. Serum levels of leptin and urine VMA were measured at baseline and during the 12th week. Differences over time and between the treatments (green tea or placebo) over time were determined using two-factor ANOVA with repeated measures. In comparing the two groups, differences in weight loss were 2.70, 5.10, and 3.3kg during the 4th, 8th, and 12th weeks of the study, respectively. At the 8th and 12th weeks of the study, body weight loss was significantly different (P < 0.05). At the 8th week, the difference in resting energy expenditure was 183.38kJ/day (P < 0.001), the difference in the respiratory quotient was 0.02 (P < 0.05), and no significant differences existed in satiety score, food intake, or physical activity. Urine VMA was significantly different in the 12th week of the study (P < 0.05). We conclude that green tea can reduce body weight in obese Thai subjects by increasing energy expenditure and fat oxidation.” ((Physiol Behav. 2007 Oct 18))
While we wish this particular study would have noted the dosage amounts, it did conclude that the green tea was effective. Many other studies conclude the same thing.
In conclusion, green tea is an effective weight loss supplement that has been shown in independent clinical studies to aid weight loss. Is it a miracle ingredient that will melt the pounds away overnight? No. But it will help quite a bit and its always a good thing to see it included in your potential diet pill.