Lesson 1 of 5 · Gut Health Reset · about 7 minutes
Key takeaways
- Digestion is a journey through several organs, each with its own job.
- Your large intestine is home to trillions of microbes, known as the gut microbiome.
- A varied, plant-rich diet is one of the best ways to support a diverse microbiome.
- Sleep, stress, movement and regular meals all affect how your gut feels.
Bloating, irregular bowels, heartburn and tummy discomfort are some of the most common reasons people seek nutrition advice. Before changing what you eat, it helps to understand how your gut actually works. Once you know what is happening inside, the advice in the rest of this course will make much more sense.
The journey of your food
Your digestive system is a long, muscular tube, helped along by the liver, gallbladder and pancreas. Here is what happens at each stage:
| Stage | What happens |
|---|---|
| Mouth | Chewing breaks food into smaller pieces; saliva starts to digest starch. |
| Oesophagus | Muscles push food down to the stomach. |
| Stomach | Acid and enzymes break down protein and mix food into a thick liquid. |
| Small intestine | Most nutrients are absorbed here, helped by bile and enzymes from the pancreas. |
| Large intestine (colon) | Water is absorbed, gut microbes ferment fibre, and stools are formed. |
| Rectum | Stools are stored until you go to the toilet. |
Food usually takes somewhere between one and three days to pass all the way through, though this varies a lot from person to person.
Meet your microbiome
Your large intestine contains trillions of bacteria, along with other microbes such as yeasts and viruses. Together they are called the gut microbiome. Everyone’s mix is a little different, shaped by genes, diet, medicines, age and environment.
What do gut microbes do?
- Ferment fibre that your body cannot digest, producing short-chain fatty acids that help nourish the cells lining your colon.
- Help make some vitamins, such as vitamin K.
- Support the gut barrier and the immune system.
- Communicate with the brain through nerves and chemical signals, often called the “gut–brain axis”.
Research on the microbiome is growing fast, but it is still early days. Be cautious of products or tests promising to “fix” your microbiome. The most reliable advice remains simple: eat a wide variety of plant foods.
Variety is key
Different microbes prefer different fibres. Eating a range of vegetables, fruit, wholegrains, pulses, nuts, seeds, herbs and spices feeds a wider community. A simple target many people find helpful is to try to add new plant foods across the week, such as a different dal, a new vegetable, or a sprinkle of seeds.
Everyday habits that help your gut
What you eat matters, but so does how you live. The gut is sensitive to your routine.
- Eat regularly: regular meals help your bowel find a steady rhythm.
- Chew well and slow down: eating quickly can mean swallowing air and more bloating.
- Drink enough fluid: water helps fibre do its job and keeps stools soft.
- Move your body: walking and other activity help food move through the gut.
- Manage stress: stress can speed up or slow down the gut and make symptoms feel worse.
- Sleep well: poor sleep is linked to more gut discomfort for many people.
Some medicines, especially antibiotics, can change the microbiome for a while. Never stop a prescribed medicine without speaking to your doctor.
Try this this week
- Keep a simple 7-day note of meals, bowel habits, stress and symptoms. You will use it later in the course.
- Take a 10–15 minute walk after your main meal on at least four days.
- Add one new plant food to your shopping, such as a different lentil, a new vegetable or some seeds.
- Put your fork down between bites at one meal each day.
Quick check
1. Where are most nutrients absorbed?
In the small intestine.
2. What do gut microbes ferment in the large intestine?
Fibre that your body cannot digest on its own.
3. Name two non-food habits that affect your gut.
For example sleep, stress, physical activity and eating speed.
Next: Lesson 2: Fibre, Prebiotics and Probiotics
Struggling with bloating or irregular bowels? Get a personalised plan through our Repair Your Gut online consultation or message Dr. Rida Saeed on WhatsApp +971 54 448 6145.
This lesson is for general education only and is not a substitute for medical advice. Please speak to your doctor or a qualified health professional about your individual needs.