Moderate caffeine consumption may suppress appetite and stimulate the body to burn energy (3).
However, these effects appear to diminish once caffeine tolerance builds up (8).
This means that a weight loss tea with a high caffeine content will not be effective if you already consume caffeine daily. Even if you do initially lose some weight by increasing caffeine intake, the effects will be short lived.
However, one study found that habitual caffeine consumption may help with weight maintenance after weight loss has been achieved (4).
More information on caffeine's effect on weight loss can be found here.
These are some of the caffeine containing ingredients you may see in weight loss teas.
- Tea: this includes sench green tea, pu-erh tea and matcha green tea. See below for a look the weight loss properties of tea.
- Guarana: has a very high caffeine content and can be found in many weight loss products. There is a lack of evidence to suggest guarana has any weight loss properties aside from caffeine.
- Yerba Mate: also has a high caffeine content. Some studies have shown yerba mate may be able to suppress appetite and increase fat burning. However, most have been conducted on animals rather than humans (5, 6).
Summary: Most ingredients in weight loss teas do not have any solid scientific evidence to support their weight loss. Although caffeine has some positive weight loss effects they are insignificant and short lived.
Can Green Tea Help with Weight Loss?
Nearly all weight loss teas contain some form of green tea.
All types of tea—including green, black and oolong—actually come from the same plant. The difference lies solely in the method of processing.
In fact, herbal teas that do not contain leaves from this plant are technically not considered a tea. Herbal and fruit infusions are correctly known as tisanes.
The two active components of green tea that may contribute to weight loss are caffeine and catechins, which have antioxidant actions in the body. Green tea contains twice the amount of catechins as black tea.
The most potent green tea catechin seen advertised in health products is EGCG—short for epigallocatechin gallate.
The weight loss effects of EGCG appear to be most prominent when caffeine is also present. It relies on the effects of caffeine.
For example, there is no trend in fat loss percentage in the scatterplot diagrams below when comparing those who use green tea extract and placebo.
Interactions between time, treatment group and baseline BMI for changes in gynoid (A) and tissue (B) percent fat in overweight or obese women assigned to green tea extract or placebo for 12 months.National Center for Biotechnology Information
Unfortunately, as mentioned above, those who regularly consume caffeine will experience little to no weight loss benefits from green tea either (8).
This video describes the weight loss properties of green tea in more detail.Interestingly, race may also influence the weight loss effects of caffeine somewhat. Studies have shown a greater response in Asian populations compared to Caucasians (10).
Summary: Green tea does have some fat-burning and weight loss properties. However, these effects are not likely to produce any significant change in body weight.
What About Detox Teas … Do They Work?
Many weight loss teas also claim to be able to detox your body.
As with any commercial detox product, this is simply untrue.
Your liver, kidneys and immune system are all a healthy person needs to help eliminate everyday exposure to so-called toxins.
For a more in-depth look at debunking the detox myth, take a look at this article.
Summary: Detox products, including detox teas, do not work. Several organs detox your body as efficiently as possible.
Are There Any Other Benefits to Drinking Tea?
Tea is a healthy drink choice, especially if no sugar is added.
Replacing high-sugar, high-calorie beverages with a cup of hot or cold tea can help with weight loss and weight management, as tea is calorie free.
In addition, green tea in particular contains high levels of antioxidants and catechins.
Summary: Tea is a healthy alternative to sugary drinks. Not only is it naturally calorie free, but it contains beneficial compounds that can improve health.
Are There Any Side Effects?
Weight loss teas can produce the following side effects depending on the ingredients of the tea.
- Laxative effects: diarrhea, Stomach cramps and pain.
- Reduced efficacy of contraceptive pills.
- Sensitivity to caffeine: rapid heart beat, poor sleep, irritability.
- Contamination: Some herbal weight loss products may be contaminated with substances not declared in the ingredients.
Summary: Does Weight Loss Tea Work?
It's unlikely you will lose weight as a direct result of drinking weight loss tea.
The same goes for detox teas, fit teas or similar.
However, many weight loss teas come with a healthy meal plan and exercises to follow in addition to drinking the tea itself.
It's this improved diet and increased physical activity that is responsible for weight loss after drinking tea…not the tea itself.
If you like the taste and don't mind paying the inflated price, then weight loss teas are typically a safe and healthy choice.
Just know that regular green teas and herbal teas are equally as good for you … and much healthier for your wallet.
Reposted with permission from our media associate DIETvsDISEASE.