Gut and hormonal health are deeply interconnected, playing a central role in how we feel, function, and thrive on a daily basis. Together, they influence everything from digestive efficiency and energy levels to mood and immune defense. A well-balanced gut microbiome supports hormonal regulation by aiding in absorbing nutrients, detoxifying unwanted substances, reducing inflammation, regulating the immune system, and even helping to produce neurotransmitters. On the other hand, hormones regulate essential processes like metabolism, food choices, sleep, mood, appetite, and stress responses, which in turn can affect the health of your gut.
When one system is thrown off, the other often follows. With stressors like poor diet, lack of sleep, and exposure to environmental toxins, it’s easier than ever to disrupt this delicate balance. As Dr. Stephen Feig highlights, recognizing the signs of an imbalance and supporting the body through nourishing foods, addressing gut health, lifestyle changes, and getting your hormones and gut tested can greatly improve your overall health.
Gut Health and Its Role in the Body
Your gut health is implicitly linked to the food that you eat and the balance and function of microorganisms living in your digestive tract. This gut microbiome includes trillions of bacteria, fungi, and other microbes that play a central role in digestion, nutrient absorption, and immune response. The number of bacteria in the human gut exceeds the number of stars in the Milky Way galaxy. While the exact number of gut organisms is difficult to precisely count, estimates suggest there are around 38 trillion to 100 trillion microbial cells in the human gut.
A well-functioning gut supports many processes beyond digestion. The gut microbiome helps synthesize certain vitamins, protects against harmful infections, detoxifies cancer-causing substances, and communicates with multiple systems in the body. In some cases, shifts in gut bacteria have been linked to chronic health issues such as skin disorders, including rosacea, acne, eczema and psoriasis (through the gut-skin axis); neurological and psychiatric conditions like depression, anxiety, autism, and neurodegenerative diseases such as Parkinsons disease; cardiovascular diseases including high blood pressure and heart failure; autoimmune illnesses; digestive symptoms (bloating, gas, constipation/diarrhea); gastrointestinal disorders like inflammatory bowel disease and irritable bowel syndrome; chronic inflammation; insomnia and sleep issues, metabolic diseases such as obesity and type 2 diabetes; and certain cancers, particularly colorectal and liver cancers.
Hormones and How They Affect the Body
Hormones are chemical messengers produced by glands in the endocrine system. They travel through the bloodstream to regulate key functions such as metabolism, growth, mood, energy levels, sexual desire, and reproductive health. These signals help coordinate everything from how you feel when you wake up in the morning, to your sleep cycles, your appetite, and even your body temperature.
Small hormonal imbalances can lead to major changes in mood of physical function. A person with an unrecognized thyroid disorder might feel unusually fatigued, have cold hands/feet, sluggish bowels, experience weight fluctuations, or struggle with mood swings. In women, shifts in estrogen, testosterone, or progesterone can affect mood, skin health, sexual desire, hair loss, menstrual cycles, and fertility. In men, low testosterone may depress mood and motivation, lower sexual desire, and reduce energy and muscle mass. Hormones keep the body at a delicate rhythm, and when that rhythm is disrupted, the effects ripple throughout various systems. Such disruptions can lead to appetite dysregulation and food cravings that result in more chronic health concerns like putting on extra weight around your belly, which results in insulin resistance (pre-diabetes or diabetes).
How the Gut and Hormones Work Together
The gut and hormones are in constant communication, forming a complex feedback loop that influences many aspects of health. The gut microbiome can impact how hormones are produced, broken down, and distributed across the body. Certain gut bacteria even help manufacture neurotransmitters like serotonin, which assists in feelings of happiness and with overall mood regulation.
Connections such as the gut-brain axis and the gut-liver axis show how intertwined these systems are. Through these pathways, signals from the gut can influence how you cope with stress, your focus and memory, skin health, blood sugar levels, and inflammation throughout your body. An imbalanced gut may contribute to anxiety, insomnia, and heightened stress hormones or disrupt insulin sensitivity, affecting both emotional and metabolic health. Having these out of balance can make you fat, fatigued, and diabetic. This two-way relationship highlights why gut care is so important to hormonal stability and overall health.
How Do I Know if I Have a Gut Imbalance?
The most common symptoms of gut imbalances are bloating after meals, gas, stinky farts, gut cramps, belching, constipation, brain fog, diarrhea, food cravings, and/or fatigue. You don’t need to have all of these symptoms. Even just a few of them can be a strong indicator of a gut imbalance.
How Do I Know if I Have a Hormone Imbalance?
Some of the most common signs of hormone imbalances are fatigue, cold hands or feet, needing to take a nap in the afternoon, energy swings through the day, lightheadedness on standing, insomnia, low sex drive, dry skin, mood issues – especially rapid shifts in mood, hair thinning or loss, excessive hair growth, depression and/or anxiety, and excessive weight gain or loss.
In women, hormone imbalances may show up as menstrual cramps, breast tenderness, irregular menstrual cycles, severe premenstrual symptoms, excessive menstrual bleeding, mood swings, hot flashes, night sweats, insomnia, vaginal dryness, pain during sex, emotional sensitivity, etc.
Common Disruptors of Gut and Hormonal Health
Modern life presents many challenges to maintaining a healthy gut and balanced hormones. A diet that is rich in animal products (meat and dairy) or processed meats, is generally associated with a gut microbiome that has reduced beneficial bacteria and favors inflammation, whereas plant-based diets tend to support a more diverse and anti-inflammatory microbiome. Diets rich in animal products are often low in fiber and other micronutrients found in plant-based foods, which are known to have anti-cancer properties.
Highly processed diets, high in refined sugars and low in fiber, can feed harmful bacteria while starving beneficial ones. This shift can interfere with hormone signaling and disrupt digestive efficiency. Use of medications like acid blockers, antibiotics, or hormonal contraceptives has been associated with disturbances in microbial diversity and endocrine function. Chronic stress is another silent disruptor. When the body remains in a prolonged state of fight-or-flight, cortisol levels rise, which can weaken the gut lining, alter the microbiome, and adversely affect hormone production. Sleep deprivation only adds to the problem, reducing the body’s ability to repair and regulate itself
Supporting Gut Health to Boost Hormonal Balance
Providing the gut with a variety of whole, plant-based foods helps encourage a diverse microbiome. Fermented items such as kefir or kimchi can introduce live cultures that support microbial balance, while prebiotic-rich choices like garlic and oats feed beneficial bacteria already present. Leafy greens, legumes, and colorful fruits also help maintain microbial diversity and inflammation control.
If your gut microbiome is significantly out of balance, just changing your diet is often not enough to address chronic health problems and/or long-standing gut symptoms. It’s critical to have a comprehensive stool analysis to determine the presence of undesirable organisms and/or an imbalanced microbiome (dysbiosis).
In addition to stool testing and good nutrition, daily habits make a significant difference. Reducing stress through activities like walking, meditation, or creative hobbies helps regulate cortisol and supports a healthier gut-brain connection. Prioritizing quality sleep and minimizing exposure to unnecessary medications (even over-the-counter medications) or environmental toxins also play a role. These small, consistent choices create a foundation that allows both the gut and hormones to function more harmoniously.
Noticing When Things Are Off
When gut or hormonal health is out of sync, the body often signals distress in subtle but persistent ways. Digestive issues like bloating, gas, belching, irregular bowel movements, food sensitivities, or food cravings may point to a microbial imbalance. On the hormonal side, symptoms such as fatigue, loss of motivation or drive, drops in energy throughout the day, mood instability, loss of libido, or unexpected weight changes can be signs that something deeper is at play.
Tuning into these cues is the first step. Getting tested is usually the next thing needed to identify the root issues. Ask your healthcare provider to test your thyroid in a comprehensive manner that includes tests for Free T-3, Free T-4, Anti-TPO, Anti-TG, and TSH. Testing for fasting insulin, cortisol, thyroid hormones, and sex hormones such as testosterone, progesterone, and estrogen can be important in men and women. Consider salivary cortisol testing when fatigue, anxiety, or difficulty falling asleep is present, and of course, a comprehensive stool test that looks at your microbiome balance.
Hormone imbalances can often be treated with supplemental hormones and sometimes can be balanced naturally with supplements and dietary changes. For example, the supplement indole-3-carbinol (I3C) can influence hormone balance by modulating estrogen metabolism. I3C promotes the conversion of estrogen into less potent forms, instead of the more harmful ones such as 16-αOHE1. I3 C also inhibits enzymes that convert other hormones into estrogens. This shift may reduce the effects of excess or toxic estrogens, allow the gut to detoxify unwanted sex hormones, and potentially decrease the risk of hormone-sensitive cancers like breast or uterine cancer
Once your comprehensive stool testing is complete, a doctor who is trained in microbiome balancing can offer you a comprehensive protocol of foods to eat and to avoid, along with supplements that aim to increase the number of beneficial bacteria and diminish the out-of-balance or pathogenic organisms that reside in your gut.
Comprehensive gut and hormone testing can help identify imbalances before they lead to more serious conditions, allowing for more targeted and effective support. Paying attention to changes in sleep, gut function, mood, skin, and even libido can offer additional insight into what your body might be trying to convey. Even if your health issues have persisted for many years (or decades), by addressing the root causes, recovery is possible!
