When your mood feels off, what you drink is rarely the first thing that comes to mind. It’s just something you sip. At most, you might notice it affects your stomach and leave it at that. However, the gut-brain axis means your drink choices can influence how clearly you think, how stable your mood feels and how well your brain functions throughout the day.
How Does Your Gut Influence Mood and Thinking?
The gut-brain axis refers to how your gut influences your mood and cognitive function. Basically, it’s the communication network between your digestive system and your brain. It works in both directions, meaning your brain can affect your gut, and your gut can influence your brain in return.
The Systems Involved in the Gut-Brain Axis
The connection between the gut and the brain relies on several systems working together. One of the most important is the enteric nervous system — a neural network within your gastrointestinal tract that controls digestion. With 100 to 500 million neurons, it’s the most complex network outside of your brain. It can even function somewhat independently, which is why it’s often called the “second brain.”
The vagus nerve acts as the main link between the enteric nervous system and your brain. It carries sensory information about what’s happening in your gut to your brain, and sends signals back to regulate digestive activity.
Another important part of the gut-brain axis is the gut microbiome, or the trillions of bacteria living in your digestive tract. They help produce chemicals your brain depends on, including serotonin or the “feel-good” chemical. This is one reason your gut health is closely linked to how you feel.
Research also shows that your gut bacteria can affect how well your brain works. A healthy gut helps lower inflammation in your body, which is a major factor in cognitive decline and neurodegenerative diseases like Alzheimer’s.
What Happens When There’s an Imbalance in the System
When the system is out of balance, you may notice brain fog, low mood or trouble focusing. In more serious cases, poor communication between the gut and brain can cause gut-brain axis disorders — also known as disorders of gut-brain interaction. These include conditions like irritable bowel syndrome, functional dyspepsia and reflux hypersensitivity.
In addition to causing physical discomfort, these conditions can also impact your mental health. Pain, cramping and urgent trips to the bathroom can disrupt your daily life. They can also make activities like eating out and traveling feel stressful or even embarrassing. Some people struggling with gut-brain axis disorders begin to avoid social situations altogether. This can rob you of important experiences and affect your overall mental well-being.
How Can Drinks Impact Your Gut Health?
Your diet has a big impact on the composition and function of your gut microbiome. Although food usually gets the attention, what you drink throughout the day is also important. Every sip can either support or harm your gut bacteria over time.
Drinks can support your gut in several ways. Some, like water, help move food through your system and break down food into usable nutrients. Others work as prebiotic carriers, which means they feed the good bacteria already living in your system so they can grow and stay active.
There are also probiotic drinks. These add live, beneficial bacteria to your gut, helping keep everything in balance. Lastly, you have polyphenol-rich options that contain plant compounds to support a healthier gut environment and encourage the growth of helpful microbes. On the other hand, drinks like sugary soda can throw off the balance of your gut microbiome. That’s why you might feel depressed, gloomy, irritable and unfocused.
What Drinks Improve Cognitive Function and Mood?
As more people start paying attention to gut health, digestive health drinks have quickly followed. The market reached $30.7 billion in 2025 and is growing at a compound annual growth rate of 6.1%. This shows just how much interest there is in supporting both gut and brain health through simple choices.
If you want to support your energy levels, mood, stress response and cognitive function, here are a few drinks worth trying.
1. Kombucha
This fermented tea is made from sweetened black tea, bacteria and yeast. It contains probiotics that help support your gut microbiome and digestion. It’s also rich in antioxidants, which help reduce inflammation. You can make kombucha at home, but if you prefer to buy, choose options lower in added sugar to keep it more gut-friendly.
2. Kefir
Kefir is a fermented dairy drink made using different strains of bacteria and yeast. It has a tangy flavor similar to yogurt, but with a thinner, drinkable texture. During fermentation, it forms compounds that may help fight harmful microbes. A study also suggests that kefir may influence how your body produces and uses serotonin, which is important for mood and the gut-brain connection.
3. Beetroot Juice
Beetroot juice can help improve blood flow to the digestive system because it’s high in nitrates. It also contains compounds linked to better digestion and liver health, both of which contribute to a healthier gut and overall well-being.
4. Ginger Tea
This simple herbal drink supports digestion by helping food move through your system more efficiently. You can also drink it to soothe your digestive tract and reduce bloating, making it a gentle option for everyday gut support.
5. Jun
Similar to kombucha, jun is a fermented tea. It is made with green tea and raw honey and supports a diverse and balanced gut microbiome because it contains both prebiotics and probiotics. Its antioxidant properties also help reduce inflammation, and it’s usually easier on digestion compared to other fermented drinks due to its low acidity.
Sip Smarter, Think Sharper, Feel Better
What you drink can influence your mood and cognitive health, so it’s time to start being picky. By adding a fermented drink to your day, choosing tea over another sugary option, or simply drinking more water can begin to support your mood, your focus and your overall sense of balance. These simple habits can also help you avoid gut-brain axis disorders.
Want to unlock greater wellness?
Listen to our friends over at the Wellness + Wisdom Podcast to unlock your best self with Dr. John Lieurance; Founder of MitoZen; creators of the ZEN Spray and Lumetol Blue™ Bars with Methylene Blue.
