When the gut–liver–brain connection is out of balance, people often notice shifts in energy, mood or general wellbeing. These changes link back to how closely the gut, liver and brain work together. They constantly exchange signals that help regulate metabolism, immunity, inflammation and emotional health. When one part of the system comes under pressure, the effects can be felt elsewhere too.
In this episode of The Choice Space, Dr Lee David speaks with hepatologist and researcher Professor Debbie Shawcross about how these systems communicate and why realistic, everyday choices can support better health. Debbie’s work explores chronic liver disease and the microbiome, offering clear explanations and practical guidance.
They begin with the liver – the body’s central processing centre. Everything we eat is absorbed through the gut and taken directly to the liver, where nutrients are processed, toxins filtered and vital proteins and hormones produced. Because the gut and liver are linked by the portal vein, the two operate as a closely connected pair. What affects the gut influences the liver, and changes in the liver can affect how the rest of the body functions.
The microbiome plays a key part in this relationship. Debbie describes it as a busy, diverse ecosystem that helps digest food, support immunity and influence mood-regulating hormones like serotonin. A varied microbiome is more resilient. When diversity falls – through stress, illness, antibiotics or highly processed foods – the immune system can weaken, inflammation can rise and the body’s internal balance becomes harder to maintain.
Food is one of the simplest ways to support this diversity. Colourful, fibre-rich meals help beneficial bacteria thrive. Debbie shares straightforward tips, including adding lentils or beans to familiar dishes and using frozen vegetables as a cost-effective way to increase variety. She also highlights a surprisingly powerful choice – an apple a day. Apples contain pectin, a type of fibre the microbiome uses to produce helpful compounds that support both gut and brain health.
Alcohol is another area they explore openly. Many people use alcohol to unwind, but biologically it works against both relaxation and sleep. Alcohol disrupts the gut barrier, affects the microbiome and interferes with the brain’s overnight processing of emotion. Even moderate amounts can have an impact. Debbie encourages alcohol-free days, gentle curiosity about habits and practical alternatives rather than strict rules.
Movement adds additional support. Exercise encourages the liver to clear fat, helps the microbiome function more effectively and lifts mood through hormonal changes. These benefits don’t rely on high-intensity training. Short walks, taking the stairs, brief movement breaks and time outdoors can all contribute to better health and steadier energy.
Throughout the conversation is a steady message of compassion. There is no single ideal diet or perfect lifestyle routine. Instead, wellbeing grows from noticing what the body needs and making small, sustainable adjustments. A few extra vegetables, a walk outside, an apple instead of a drink – these changes are manageable and, over time, make a meaningful difference.
Choice Space Takeaways
• Variety supports the microbiome – colourful meals and simple fibre-rich additions go a long way.
• Alcohol disrupts gut health, sleep and mood – small reductions can help restore balance.
• Movement benefits the liver, the microbiome and emotional wellbeing – frequent short bursts count.
• Frozen fruit and vegetables offer an affordable, practical way to increase diversity.
• Sustainable shifts beat strict overhauls – consistency matters more than intensity.
• Small steps build change – an apple, a walk, a lighter evening routine.
About the guest
Dr Debbie Shawcross is Professor of Hepatology and Chronic Liver Failure at King’s College London and Consultant Hepatologist at King’s College Hospital. A specialist in hepatic encephalopathy and cirrhosis, she is EASL Secretary General, chairs the BSG Research Committee, and is Clinical Advisor to the British Liver Trust. Her research investigates the gut-liver-brain axis and microbiome in chronic liver failure, leading European trials of faecal microbiota transplantation, including the NIHR-funded PROMISE Trial. A long-standing advocate for gastroenterology training and mentorship, she has held key leadership roles with the BSG, Health Education England and charities supporting liver and digestive health.
