BloomWellNeither wins on effect. In a 22-trial review only green tea beat placebo, at low certainty. The cup you can keep drinking daily is the one that counts.
Walk down any wellness aisle and the two sit side by side. Slimming tea on one shelf, weight loss coffee on the other, both promising the same lighter morning. Most women past 50 pick by flavor or by whichever ad got to them last.
That is the wrong sorting question. The research on both is modest and slow, so the deciding factor is not which one is stronger on paper. It is which one you are still reaching for two months from now, on a tired Tuesday, without thinking about it.
So this article does not rank them by effect. It sorts them by fit, and the trials themselves point at why: what they measured was people drinking something every day for weeks, not a dose that works on its own.
The most useful comparison is a 2024 network meta-analysis in the British Journal of Nutrition, which pooled 22 randomised trials covering 1,710 adults. It set tea and coffee against each other and against placebo and water, which is exactly the head to head most shelves never give you.
The result was narrow. Green tea beat placebo by roughly 1.23 kg on average, rated low certainty. Coffee, decaffeinated coffee, green coffee, black tea and sour tea showed no significant weight loss effect at all in that pooled analysis.
Read that honestly and it settles the argument in an unexpected way. Neither drink is a lever. The authors themselves called the evidence very low to low certainty and asked for better long-term research, which is a polite way of saying the daily habit matters more than the brew.
The same trials hand you a second number that gets ignored. Their average duration was about ten weeks. Nothing in that literature was measured over a fortnight, so a product you abandon in week two was never tested the way you are using it.
“The honest question is not which drink is better. It is which one your actual mornings and evenings will absorb without a fight.”
A 2021 review in Physiological Research puts the same idea in daily terms. It describes weight-related effects as requiring roughly three to four cups of strong tea a day, sustained for at least eight weeks, with a comparable daily count on the coffee side.
Three or four cups a day for two months is not a purchase. It is a routine. That reframes the whole comparison: the honest question is not which drink is better, but which one your actual mornings and evenings will absorb without a fight.
Here is where a lot of women quietly quit. Strong coffee on an empty stomach can leave a burning, jittery, slightly nauseated hour, and past 50 that sensitivity often gets sharper rather than milder. The tin stays on the counter, unopened, and the habit dies.
"Pooling 22 randomised trials in 1,710 adults, green tea drinking may result in a small weight loss compared with placebo, while coffee, decaffeinated coffee, green coffee and black tea showed no significant effect."
The Physiological Research review notes that coffee's benefits appear not to depend on caffeine at all, pointing instead to its other components. So loading more caffeine into your morning is not the thing doing the work, which makes tolerating it a poor trade.
The same review adds a caution that cuts both ways: it warns that tea polyphenols can burden the liver, particularly when taken on an empty stomach, and recommends drinking tea as a beverage rather than swallowing concentrated pills.
No, and that is the part most comparisons get wrong. A weight loss coffee asks you to replace a cup you already love and have already tuned to your taste, your mug, your hour. Replacement is the hardest behavior change there is.
A tea ritual is additive instead. Your usual coffee stays exactly where it is in the morning, and the tea occupies the hours coffee never claimed anyway: mid-afternoon, after dinner, the stretch when you want something warm but not another jolt.
That difference is not a small preference. Adding to a routine survives a bad week far better than subtracting from one, and given that both drinks tested as modest, the version you can actually repeat is the only version worth choosing.
This is the practical reason a three-times-daily tea keeps surfacing for women in this situation. All Day Slimming Tea is built around that shape, and the maker describes it as inspired by a Nicoya recipe, suggested morning and evening as a steady rhythm.
Free to read · The maker's claims and terms are on their official page
BloomWell did not create this tea and makes no health claims about it. Every claim about what it does belongs entirely to the maker. What we can say is why the format itself is easier to keep: it slots into hours you are not defending.
Nicoya, in Costa Rica, is one of the world's recognised Blue Zones, and the habit worth borrowing there is rhythm rather than any single ingredient. Small, repeatable, folded through the day rather than one heroic effort that collapses by Thursday.
One thing to hold onto before you judge any of this. Even the winning arm in that analysis moved a little over a kilogram across the whole review, rated low certainty. A warm daily habit is a reasonable thing to enjoy. It is not a treatment, and nobody should sell it as one.
If you tolerate strong coffee, already drink it daily, and want nothing new in your morning, a coffee-based product is at least honest about where it fits. The pooled trials simply did not find a weight effect for it, so expect the ritual, not the result.
If mornings are already spoken for, if strong caffeine turns your stomach, or if you have quit two products because you forgot them by week two, the additive tea format is the easier bet. Not because it is stronger. Because you will still be doing it.
One last honest note. Persistent bloating, unexplained weight change, or new digestive pain deserves your doctor, not a beverage decision. Read the maker's full explanation if the ritual fits your day, and weigh it with clear eyes.
Across 22 randomised trials in 1,710 adults, only green tea showed a weight difference versus placebo. Coffee, decaf, green coffee, black tea and sour tea did not. [1]
Only green tea beat placebo, by about a kilogram, at low certainty.
Pooled trials ran roughly ten weeks, so quitting early tests nothing.
Tea fills hours coffee never claimed, so your morning stays intact.
| Format | Trial result | Asks you to | Best for |
|---|---|---|---|
| Green teaCamellia sinensis | Beat placebo, low certainty | Add 3-4 cups daily | Steady daily ritual |
| Black teaCamellia sinensis | No significant effect | Add cups daily | Gentler caffeine load |
| Weight loss coffeeCoffea arabica | No significant effect | Replace your morning cup | Committed coffee drinkers |
| Green coffeeCoffea arabica | No significant effect | Replace or add a dose | Those tolerating caffeine |
In a 22-trial review, only green tea beat placebo, by about 1.23 kg at low certainty. Coffee showed no significant effect. Both are modest, so pick the one you will keep drinking.
No. A tea ritual is usually additive, filling afternoon and evening hours coffee does not occupy. Replacing a morning cup you already love is the harder habit to sustain.
That is a common reason people quit. One review notes coffee's benefits appear not to depend on caffeine, so tolerating discomfort for it is a poor trade. Ask your doctor.
The pooled trials averaged about ten weeks, and one review asks for eight weeks minimum at three to four cups daily. Anything shorter was never really studied.
No. BloomWell is an editorial brand, not a medical provider. Nothing here diagnoses, treats, cures, or prevents any disease. Talk with your own doctor about health concerns.
Readers pacing this across the ten week window tend to look at the maker's larger bundle rather than a single tin.
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