Many “flat tummy” teas are just laxatives in a cute box. Here’s what actually helps you feel lighter.

The short answer: So, do detox teas work? Not the way the box promises. Most detox teas work by making you go to the bathroom more, usually with a laxative herb like senna. That can make you feel lighter for a day, but it doesn’t flush toxins or burn fat.

It’s Monday morning. Your jeans feel tight after a weekend of takeout, and a pastel box pops up in your feed promising a flat belly in 14 days. Before you tap buy, it helps to ask the real question: do detox teas work, or is it just clever marketing?

Here’s the honest breakdown: what’s in the bag, why the scale drops so fast, and what actually helps you feel lighter. Also, no starving, no shame and no pastel box required.

Do detox teas work?

Here’s what the research says. According to the National Center for Complementary and Integrative Health (NCCIH), there have been very few good human studies on detox programs. In addition, the studies that do exist are small and low quality.

For example, a 2015 review found no convincing evidence that detox diets help with weight or remove toxins from the body. Then a 2017 review found that juice and detox diets cause early weight loss. However, that weight tends to come back once people eat normally again.

So when people ask “do detox teas work,” the fair answer is this: they can change how often you use the bathroom. But that’s not the same thing as cleaning out your body. And that’s not the same thing as losing fat.

The marketing has also caught regulators’ attention. In 2020, the Federal Trade Commission settled with detox tea seller Teami over claims that its teas could fight cancer and unclog arteries. As part of the deal, the company paid $1 million, and more than 20,000 buyers later got refunds.

What’s actually inside a detox tea

Turn the box over and read the ingredients. Many detox and “tummy” teas lean on the same few herbs.

• Senna leaf. This is a stimulant laxative. In fact, it’s sold as an over-the-counter remedy for occasional constipation.
• Cascara or rhubarb root. These are also laxatives, so they push things through faster.
• Dandelion or parsley. These are often added because they may make you pee more.
• Green tea or mate. These bring caffeine, which can also send you to the bathroom.
• Ginger, peppermint or lemongrass. These are mostly there for flavor, and they’re the nicest part.

Also, many blends don’t list how much senna is in each bag. That means you can’t really know your dose. So if senna is near the top of the list, think of it as a laxative, not a wellness drink.

Why the scale drops fast (and comes right back)

Here’s the trick behind the before-and-after posts. When a laxative or diuretic herb moves food and water out faster, the scale drops. Your belly may look flatter for a day or two, too.

But that’s water and stool, not body fat. So once you stop the tea and drink normally, the number usually creeps right back. That’s why so many people end up on a second and third box.

Meanwhile, regular laxative use can have real downsides. For instance, senna can cause cramping, diarrhea and dehydration. Plus, with longer use, it may throw off your electrolytes and make your gut lazy. That’s why the label usually says to use it for no more than a week unless your doctor says otherwise.

Also, be careful if you take other medications. Laxative teas can speed food through so fast that some medicines may not absorb well. So if you take any daily prescription, ask your doctor or pharmacist first.

What about juice cleanses?

Juice cleanses sell the same promise in a cold bottle. Still, the NCCIH notes that the early weight loss on juice diets tends to return once you go back to normal meals.

There’s another catch. Juice on its own is low in protein and fiber. That’s why you may feel shaky, hungry and cranky by 3 PM. Also, unpasteurized juice can carry germs that make some people sick, especially kids, older adults and anyone with a weak immune system.

So if you love fresh juice, enjoy a small glass with a real meal. But skip the three-day, juice-only plan.

Your body already has a cleanup crew

Here’s the good news. You were born with a built-in cleanup system, and it works around the clock for free.

• Your liver breaks down alcohol, medications and waste so your body can get rid of them.
• Your kidneys filter your blood and send waste out in your urine.
• Your gut moves waste along, especially when you eat enough fiber.
• Your lungs and skin help too, through breathing and sweat.

No tea can do these jobs for you. Instead, the best thing you can do is give these organs what they need: water, real food, sleep and a break from heavy drinking.

What to do instead when you feel heavy and bloated

So do detox teas work better than simple habits? No. In fact, the boring stuff tends to win. Here’s where to start this week.

• Eat more fiber, slowly. Beans, lentils, oats, apples, pears and greens keep things moving in a gentle way. Our guide to high-fiber foods shows the cheapest ones.
• Drink water through the day. Fiber works best when you’re hydrated, so keep a bottle nearby.
• Walk after meals. Even 10 minutes may help with that heavy, stuffed feeling.
• Cook with real spices. Ginger, garlic, cumin and fennel bring big flavor, and many women find warm, spiced food easy on the belly.
• Sleep and stress count too. A short night and a stressful week can both leave you feeling puffy and off.
• Ease up on alcohol. Your liver will thank you more than any tea can.

And if you love tea? Keep it. Plain ginger, peppermint, green or rooibos tea is a lovely, cozy habit. Just enjoy it as tea, not as a cleanse.

How to spot a detox tea that’s selling a myth

Next time a box pops up in your feed, run it through this quick check. If you see two or more of these, scroll on.

• It promises a number, like “lose 10 pounds in 14 days.”
• Senna, cascara or rhubarb root is one of the first few ingredients.
• It says it pulls out toxins but never names which toxins.
• It comes as a “day” tea and a “night” tea, with the night one doing the bathroom work.
• The only proof is influencer photos, not studies.

Instead, spend that $30 to $40 on a bag of lentils, a few bunches of greens and a spice you love. That said, the anti-inflammatory way of eating in our anti-inflammatory diet guide is a great place to start.

Frequently asked questions

Save this for the next time a flat-tummy ad finds you.

This article is for general information and is not medical or nutrition advice.