# July 2026 Newsletter

# Why Tea Makes You Feel Different: Tea Jitters, L-Theanine, Chaqi, and the Science Behind Tea Energy

#### Quick Answer: Why Does Tea Cause Jitters or Feel Different Than Coffee?

Tea can create a wide range of sensations depending on the balance of caffeine, L-theanine, tea variety, brewing method, and a traditional tea concept known as chaqi.

**Key Takeaways:**

- Tea jitters can refer to either a caffeine reaction or a calming, focused sensation often described as "tea drunk."
- L-theanine, a naturally occurring amino acid in tea, may help promote relaxed alertness and can influence how caffeine feels.
- Different teas contain different ratios of caffeine and L-theanine, which is why two teas can produce very different experiences.
- Chaqi (茶气) is a traditional tea concept used to describe the perceived energy, character, or body feel of a tea.
- Sheng pu-erh, shu pu-erh, yancha, and dancong oolong are often associated with stronger tea energy experiences.
- Drinking strong tea on an empty stomach can increase the likelihood of unpleasant tea jitters.
- Brewing strength, tea origin, cultivation methods, and individual sensitivity all influence how tea affects the body and mind.
- Genetics may influence how quickly your body processes caffeine, which helps explain why some people experience tea jitters more easily than others.

<span data-preserver-spaces="true">Every so often, a Traveler arrives at the tavern with an age-old question:</span>

<span data-preserver-spaces="true">"Why does this tea make me feel this way?"</span>

<span data-preserver-spaces="true">The experiences are as varied as the travelers themselves. Some feel a rush of energy. Others gain a sense of alertness that is sharp but still calm. It may be something more elusive to describe—a warmth spreading through the body, a heightened awareness, or a zen feeling that sits in the liminal state between relaxation and focus.</span>

<span data-preserver-spaces="true">All of these experiences are fairly common among tea drinkers and are generally grouped under a single term: "jitters."</span>

<span data-preserver-spaces="true">When one experiences jitters, they are essentially under the spell of a magical brew that is... ancient Chinese tea. Though not all tea-induced sensations are the same, being attentive to when one gets the jitters can unlock an understanding that helps one choose teas best suited to one's preferences and brewing habits. </span>

### <span data-preserver-spaces="true">What, exactly, are "Tea Jitters"?</span>

<span data-preserver-spaces="true">When most people describe getting tea jitters, they are usually describing one of two very different experiences.</span>

<span data-preserver-spaces="true">The first is what many would recognize as a </span>[<span data-preserver-spaces="true">caffeine</span>](https://bookstack.tea-tavern.com/books/the-traveling-tea-tavern-chronicle-newsletters/page/may-2026-newsletter)<span data-preserver-spaces="true"> response: shakiness, increased heart rate, cold sweats, dizziness, or a burst of nervous energy. These sensations are more likely to occur when </span><span data-preserver-spaces="true">drinking tea on an empty stomach or consuming</span><span data-preserver-spaces="true"> large amounts of tea in a short period.</span>

<span data-preserver-spaces="true">The second experience is something entirely different.</span>

<span data-preserver-spaces="true">Many tea drinkers describe feeling clarity, openness, warmth, heaviness, or even mild euphoria. Some call it being "tea drunk." Others refer to it as a buzz, a body feel, or simply a tea with strong energy.</span>

<span data-preserver-spaces="true">Though these two experiences are often lumped together in discussion, they actually have very different causes.</span>

#### <span data-preserver-spaces="true">The Balance Between Caffeine and L-Theanine</span>

<span data-preserver-spaces="true">First, we must point out an important distinction between tea and another mystical beverage, coffee. Though coffee can also cause a caffeine reaction, those symptoms and feelings are wholly different from tea jitters. </span>

<span data-preserver-spaces="true">One reason tea jitters feel different from simply drinking too much coffee is the presence of </span><span data-preserver-spaces="true">L-theanine, a naturally occurring amino acid found in tea leaves.</span>

<span data-preserver-spaces="true">L-theanine</span><span data-preserver-spaces="true"> contributes to tea's flavor profile. It is also associated with feelings of a relaxed state of alertness. Not only is this not a caffeine reaction, but some research even suggests that L-theanine can mitigate some of the less desirable effects of caffeine.</span>

<span data-preserver-spaces="true">The amount of L-theanine in tea varies with tea type, cultivation methods, and</span>[<span data-preserver-spaces="true"> brewing parameters</span>](https://www.tea-tavern.com/brewing-guide/)<span data-preserver-spaces="true">. This is similar to how the caffeine level in a specific tea can vary depending on the tea's origin, harvest, and </span>[<span data-preserver-spaces="true">processing techniques</span>](https://bookstack.tea-tavern.com/books/the-traveling-tea-tavern-chronicle-newsletters/page/februry-2026-newsletter)<span data-preserver-spaces="true">.</span>

<span data-preserver-spaces="true">Both caffeine and L-theanine can exist in different ratios in different teas. That's why two cups of different tea may contain similar caffeine levels yet produce very different experiences for the drinker. </span>

#### <span data-preserver-spaces="true">The Mystery of Chaqi</span>

<span data-preserver-spaces="true">Among experienced tea drinkers, another concept often emerges in conversation: chaqi (茶气).</span>

<span data-preserver-spaces="true">Chaqi can be difficult to define because it describes personal experiences that vary from one individual to another.</span>

<span data-preserver-spaces="true">Depending on who you ask, chaqi may refer to:</span>

- <span data-preserver-spaces="true">A feeling of physical warmth</span>
- <span data-preserver-spaces="true">Increased awareness or focus</span>
- <span data-preserver-spaces="true">Deep relaxation</span>
- <span data-preserver-spaces="true">A sensation of energy moving through the body</span>
- <span data-preserver-spaces="true">The perceived strength or character of a tea - this is what it most commonly means amongst Chinese speakers and practitioners of ancient Chinese medicine. </span>

<span data-preserver-spaces="true">Chaqi, then, is not one single experience but rather an umbrella term for a collection of ways high-quality Chinese teas can impact a person. Some Travelers notice chaqi immediately. Others may never experience it at all (there is nothing wrong with either the Traveler or the tea in this case). </span>

### <span data-preserver-spaces="true">Why Some Teas Feel Different Than Others</span>

<span data-preserver-spaces="true">When it comes to chaqi – especially when the word is used to describe the body of the tea itself, not the impact it has on the person drinking it – tea can be broken down into several categories. </span>

- [<span data-preserver-spaces="true">Sheng Pu-erh</span>](https://www.tea-tavern.com/product-category/teas/hei-cha-and-puerh/sheng-puerh/)
- [<span data-preserver-spaces="true">Shu Pu-erh</span>](https://www.tea-tavern.com/product-category/teas/hei-cha-and-puerh/shu-puerh/)
- <span data-preserver-spaces="true">Yancha (Rock Tea)</span>
- <span data-preserver-spaces="true">Dancong </span>[<span data-preserver-spaces="true">Oolong</span>](https://www.tea-tavern.com/product-category/teas/oolong/)

<span data-preserver-spaces="true">These teas are often described as having a more pronounced presence than lighter-style teas.</span>

<span data-preserver-spaces="true">For example, young sheng pu-erh is sometimes described as energetic, lively, or even "wiry." In contrast, aged sheng pu-erh, like our </span>[<span data-preserver-spaces="true">1995 Green Pu-erh</span>](https://www.tea-tavern.com/product/1995-green-pu-erh/)<span data-preserver-spaces="true">, is often associated with a deeper, heavier, and more relaxing character. In the case of the 1995 Green Pu-erh, it's even been compared to BBQ sauce! </span>

<span data-preserver-spaces="true">These are examples of teas whose chaqi stems largely from how they are processed. </span>

#### <span data-preserver-spaces="true">Ancient Trees, Terrace Gardens, and Tea Energy</span>

<span data-preserver-spaces="true">Of course, the source of the tea leaf itself can also impact its chaqi.</span>

<span data-preserver-spaces="true">Teas harvested from ancient or old-growth tea trees, or trees over a century old, are commonly reported to have a stronger body feel than teas produced from younger plantation-grown bushes.</span>

<span data-preserver-spaces="true">This may be because mature trees have extensive root systems that reach deeper into ancient soil, accessing minerals and nutrients unavailable to younger plants, enabling them to grow and thrive.</span>

<span data-preserver-spaces="true">Indeed, the complex and ancient brewing process used to produce </span>[<span data-preserver-spaces="true">Aini Bamboo Shu Pu'erh</span>](https://www.tea-tavern.com/product/aini-bamboo-shu-puerh/)<span data-preserver-spaces="true">, harvested from ancient forests, speaks to this truth. The bamboo brewing process is used, in part, to lighten the heavy, mineral-rich flavor of the raw tea leaves.</span><span data-preserver-spaces="true"> </span>

<span data-preserver-spaces="true">Scientific studies bear out this truth in a more modern, concrete way. Multiple studies have found that pu-erh tea has measurable differences in chemical composition compared with tea sourced from ecological forests or terrace plantations. Those chemical differences may be the key to unlocking the mystery as to why some teas produce a richer body sensation. In contrast, others feel more stimulating or caffeine-forward.</span>

<span data-preserver-spaces="true">That said, there is still magic in enjoying a cup of tea, and researchers agree that chemistry alone cannot fully explain every tea experience. Still, the evidence does suggest that origin and cultivation methods play an important role in what ends up in the cup.  
</span>

### Why Tea Affects Different People Differently

Even when two Travelers brew the exact same tea, their experiences may not be identical.

Part of the reason lies not in the teapot, but in the traveler themselves.

Modern research has found that genetics can influence how the body processes caffeine. Variations in certain genes affect the speed at which caffeine is metabolized, meaning some individuals naturally clear caffeine from their system more quickly than others.

For those who metabolize caffeine more slowly, the stimulating effects may linger longer and feel more intense. A tea that leaves one person feeling pleasantly alert may leave another feeling restless, overstimulated, or unable to sleep hours later.

Researchers have also identified genetic differences that may influence an individual's sensitivity to caffeine itself. In other words, two people may consume the same amount of caffeine, yet experience very different physical and mental responses.

This may help explain a mystery familiar to many tea drinkers: why one Traveler can happily enjoy multiple infusions of sheng pu-erh late into the evening while another carefully avoids tea after lunch.

Of course, genetics are only one piece of a much larger puzzle. Factors such as sleep quality, stress levels, food consumption, hydration, brewing methods, and overall caffeine intake all contribute to how tea affects the body.

Still, for Travelers who consistently experience stronger tea jitters than friends or family members, the answer may not be the tea at all. It may simply be that their body was written with a slightly different set of instructions.

### <span data-preserver-spaces="true">How to Reduce Unpleasant Tea Jitters</span>

<span data-preserver-spaces="true">While fascinating, tea jitters are not always welcome or pleasurable. If you've ever found yourself feeling uncomfortable after tea, consider the following ways to reduce your chances of experiencing tea jitters:</span>

#### <span data-preserver-spaces="true">Don't Drink Strong Tea on an Empty Stomach</span>

<span data-preserver-spaces="true">A common thread that weaves its way through a large number of tea-related discomfort complaints is that the tea was consumed before eating. A small meal or snack beforehand can often make a significant difference</span><span data-preserver-spaces="true">.</span>

#### <span data-preserver-spaces="true">Pay Attention to Brewing Strength</span>

<span data-preserver-spaces="true">Few things impact a tea's chaqi and overall flavor more than how it is brewed. As a general rule, using more leaf, longer steep times, or higher temperatures can increase extraction and create a more intense experience</span><span data-preserver-spaces="true">.</span>

#### <span data-preserver-spaces="true">Explore Different Tea Types</span>

<span data-preserver-spaces="true">Some Travelers discover that certain tea categories suit them better than others. If you are uncertain about which tea is best for you, we highly encourage you to attend a </span>[<span data-preserver-spaces="true">Traveling Tea Tavern</span>](https://www.tea-tavern.com/event/gongfu-tea-tasting-at-heatsync-labs-65/)<span data-preserver-spaces="true"> session. These monthly events, currently led by Tea Master Farrah, are a wonderful way to sample a wide variety of teas and meet other like-minded tea explorers</span><span data-preserver-spaces="true">. </span>

#### <span data-preserver-spaces="true">Slow Down</span>

<span data-preserver-spaces="true">Tea has always rewarded patience, both in the brewing and in its enjoyment. Rather than rushing through multiple cups or mindlessly sipping while engrossed in other tasks, consider taking time to mindfully notice how each infusion affects your body and mind</span><span data-preserver-spaces="true">.</span>

### <span data-preserver-spaces="true">Every Traveler's Journey Is Different</span>

<span data-preserver-spaces="true">One of the most fascinating aspects of tea is that two people can share the exact same leaves from the same source, processed in the same way, and yet still have two entirely different experiences.</span>

<span data-preserver-spaces="true">What one Traveler calls tea jitters, another may describe as invigorating. What one person experiences as deep relaxation, another may barely notice</span>

<span data-preserver-spaces="true">The next time a tea leaves you feeling energized, grounded, focused, or simply curious, consider that you may be experiencing more than caffeine alone.</span>

<span data-preserver-spaces="true">You may be experiencing one of tea's oldest and most alluring mysteries.</span>

<span data-preserver-spaces="true">Until next month, Travelers, may your cups be full and your journeys rewarding.</span>

<span data-preserver-spaces="true">— The Tea Tavern</span>

### Frequently Asked Questions About Tea Jitters and Chaqi

#### Why does tea make me jittery?

Tea jitters are most commonly caused by caffeine, especially when tea is consumed on an empty stomach or in large quantities. However, some tea drinkers also use the term "jitters" to describe sensations such as heightened awareness, relaxation, warmth, or mild euphoria.

#### Why does tea feel different from coffee?

Tea contains both caffeine and L-theanine. While caffeine contributes to alertness, L-theanine is associated with a calmer state of focus. The combination can create a different experience than coffee for many drinkers.

#### What is L-theanine in tea?

L-theanine is a naturally occurring amino acid found in tea leaves. It contributes to tea's flavor profile and is often associated with relaxed alertness and mental clarity.

#### What is chaqi?

Chaqi (茶气) is a traditional tea term used to describe the perceived energy, character, or body feel of a tea. Depending on the individual, chaqi may be experienced as warmth, focus, relaxation, awareness, or other physical and mental sensations.

#### Can tea make you feel "tea drunk"?

Some tea drinkers report experiencing sensations often described as being "tea drunk," including calmness, clarity, heaviness, warmth, or mild euphoria. These experiences are commonly discussed in tea culture and are often associated with chaqi.

#### Which teas are most associated with strong chaqi?

Tea drinkers often associate sheng pu-erh, shu pu-erh, yancha (rock tea), and dancong oolong with more pronounced body sensations or tea energy experiences.

#### Why do some teas feel stronger than others?

Tea experiences can vary based on caffeine content, L-theanine levels, processing methods, age of the tea, brewing techniques, cultivation practices, and individual sensitivity.

#### How can I reduce unpleasant tea jitters?

Many tea drinkers find it helpful to avoid drinking strong tea on an empty stomach, adjust brewing strength, explore different tea varieties, and pay attention to how different teas affect their body and mind.

#### Does tea from ancient trees feel different?

Many tea enthusiasts report that teas harvested from ancient or old-growth tea trees produce a stronger body feel or more noticeable chaqi. Researchers have also identified chemical differences between teas grown in different environments, though individual experiences vary.

#### Why am I more sensitive to caffeine than other people?

Research suggests that genetic differences can affect both how quickly the body metabolizes caffeine and how strongly an individual responds to it. This means two people can drink the same tea and experience very different effects.

#### Are tea jitters genetic? 

Yes. Variations in genes involved in caffeine metabolism and sensitivity may influence whether a person experiences tea jitters, prolonged alertness, restlessness, or other caffeine-related effects.

#### Why can some people drink tea before bed while others cannot?

Individual responses to caffeine vary. Genetics, overall caffeine sensitivity, sleep habits, stress levels, and the amount of tea consumed can all influence whether tea affects sleep.

### <span data-preserver-spaces="true">Sources</span>

<span data-preserver-spaces="true">Ahmed, S., Unachukwu, U., Stepp, J. R., Peters, C. M., Long, C., &amp; Kennelly, E. (2010). Pu-erh tea tasting in Yunnan, China: Correlation of drinkers' perceptions to phytochemistry. Journal of Ethnopharmacology, 132(1), 176–185.</span>

<span data-preserver-spaces="true">Fu, Z., Chen, L., Zhou, S., Hong, Y., Zhang, X., &amp; Chen, H. (2024). </span><span data-preserver-spaces="true">Analysis of differences in the accumulation of tea compounds under various processing techniques, geographical origins, and harvesting seasons.</span><span data-preserver-spaces="true"> Food Chemistry, 430, 137000.</span>

<span data-preserver-spaces="true">Hung, P.-Y. (2016). Tea Production, Land Use Politics, and Ethnic Minorities: Struggling over Dilemmas in China's Southwest Frontier. Springer.</span>

<span data-preserver-spaces="true">Keenan, E. K., Finnie, M. D. A., Jones, P. S., Rogers, P. J., &amp; Priestley, C. M.</span><span data-preserver-spaces="true"> (2011). How much theanine is in a cup of tea? Effects of tea type and preparation method. Food Chemistry, 125(2), 588–594.</span>

<span data-preserver-spaces="true">Ma, Z. (2023). Making "Senses": The qualia of Pu'er tea and sensorial encounters between tea producers and traders in southwest China. Journal of Material Culture, 28(1), 40–62.</span>

<span data-preserver-spaces="true">Vuong, Q. V., Bowyer, M. C., &amp; Roach, P. D.</span><span data-preserver-spaces="true"> (2011). L-Theanine: Properties, synthesis and isolation from tea. </span><span data-preserver-spaces="true">Journal of the Science of Food and Agriculture,</span><span data-preserver-spaces="true"> 91(11), 1931–1939.</span>

<span data-preserver-spaces="true">Wang, S., Qiu, Y., Gan, R.-Y., &amp; Zhu, F. (2022). Chemical constituents and biological properties of Pu-erh tea. Food Research International, 154, 110899.  
</span>

Cornelis, M. C., Byrne, E. M., Esko, T., Nalls, M. A., Ganna, A., Paynter, N., ... &amp; Chasman, D. I. (2015). Genome-wide meta-analysis identifies six novel loci associated with habitual coffee consumption. Molecular Psychiatry, 20(5), 647–656.

HealthPartners. (2024). Caffeine sensitivity: Why caffeine affects people differently. HealthPartners Blog.

Vergano, D. (2016). Your genes may determine how caffeine affects you. National Geographic.

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