BloomWellGreen tea catechins account for a small share. Pooled trials found about 1.38 kg with caffeine, and no measured effect from catechins alone.
Green tea accounts for a small, measurable share of weight change. A 2010 systematic review in The American Journal of Clinical Nutrition pooled fifteen randomized trials covering 1243 people. With caffeine, catechins produced 1.38 kg more loss than caffeine alone. The authors then called the clinical significance modest at best.
This is where the research gets pointed. Phung and colleagues separated the trials giving catechins alongside caffeine from those giving catechins without it, and the two groups did not behave the same way. Without concomitant caffeine, catechins showed no benefit on any anthropometric endpoint measured. What produced the difference was the combination.
A 2024 meta-analysis in the Journal of the International Society of Sports Nutrition, by Gholami and colleagues, asked whether catechin adds anything on top of exercise training. Across eight trials and 476 participants, the added effect on body weight was a standardized mean difference of 0.30.
Two teams, fifteen years apart, landed in the same small neighborhood.
Part of the gap between the research and the expectation is arithmetic. A 1.38 kg difference accumulated over 12 weeks is spread thin enough that a bathroom scale may never present it as a clean signal. It also describes the additional change attributable to the tea versus a control group, not the total change a participant experienced. That is a supporting role, not the mechanism.
This is why a daily tea is more accurately a ritual than a result. The exercise trials ran 99 to 1500 mg per day across 8 to 24 weeks, which tells you these were sustained habits. All Day Slimming Tea lists green tea in its morning blend and the maker suggests three servings daily.
“Trials giving catechins without caffeine showed no benefit on body weight, BMI, waist circumference, or waist-to-hip ratio. The combination is what moved the measures.”
BloomWell did not create this tea and makes no health claims about it.
These meta-analyses pooled averages, and an average is not a promise made to any individual. Some of those 1243 participants moved more than 1.38 kg and some not at all. If you are considering any daily supplement, particularly alongside prescription medication or a diagnosed condition, that conversation belongs with your own doctor.
If one idea is worth carrying out of this article, it is that green tea has been measured carefully and repeatedly, and it came back small. That is a usable finding, not a disappointing one. The trouble was never the tea. It was a promise attached to it that the research never made. Decide with the actual numbers in front of you.
"The administration of green tea catechins with caffeine is associated with statistically significant reductions in BMI, body weight, and waist circumference. The clinical significance of these reductions is modest at best."
Fifteen trials in 1243 people found green tea catechins with caffeine cut body weight by 1.38 kg, an effect the authors called modest at best. [1]
Pooled trials put catechins plus caffeine at 1.38 kg versus control.
Catechins without caffeine moved none of the measures studied.
A 2024 review of exercise trials landed at the same small end.
| Review | Question | Measure | Result |
|---|---|---|---|
| Phung 2010 | With caffeine | Body weight | 1.38 kg vs control |
| Phung 2010 | Without caffeine | Body weight | No benefit found |
| Phung 2010 | With caffeine | Waist | 1.93 cm reduction |
| Gholami 2024 | Added to exercise | Body weight | Small effect, SMD 0.30 |
Pooled across 15 trials, catechins with caffeine reduced body weight by 1.38 kg versus control. The reviewers called that clinically modest at best.
In that same review, trials giving catechins without caffeine showed no benefit on body weight, BMI, waist circumference, or waist-to-hip ratio.
A 2024 meta-analysis of 8 trials in 476 people found a small added effect on body weight, reported as a standardized mean difference of 0.30.
The exercise trials ran 8 to 24 weeks, most often 8 or 12, at doses from 99 to 1500 mg daily. These were sustained habits, not quick interventions.
No. BloomWell is an editorial brand, not a medical provider. Nothing here diagnoses, treats, cures, or prevents any condition. Talk with your own doctor.
Readers treating it as a long ritual tend to look at the maker's multi-month option.
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