Gut Health & Digestion Quiz

1. The human gut microbiome consists of trillions of microorganisms. Approximately how many bacterial cells does the average human gut contain?

1. Billions (about 100 billion)
2. Millions (about 10 million)
3. Tens of trillions (about 100 trillion)
4. Trillions (about 38 trillion)

2. What is the primary role of the large intestine (colon) in digestion?

1. Absorbing most nutrients from food
2. Absorbing water and electrolytes from undigested food, and housing gut bacteria that ferment fibre
3. Breaking down proteins with digestive enzymes
4. Producing bile to emulsify fats

3. Probiotics are live microorganisms that benefit health when consumed in adequate amounts. Which foods are naturally rich in probiotics?

1. All fermented foods including vinegar and pickles made with vinegar
2. Fruits and vegetables
3. White bread, pasta, and rice
4. Yoghurt, kefir, kimchi, sauerkraut, and miso

4. What are prebiotics, and how do they differ from probiotics?

1. Prebiotics are live bacteria supplements; probiotics are fibre supplements
2. Prebiotics are non-digestible food components (mostly fibre) that feed and promote the growth of beneficial gut bacteria; probiotics are live bacteria themselves
3. Probiotics improve gut health directly; prebiotics improve gut health indirectly through the immune system
4. They are the same thing — probiotic is the scientific term and prebiotic is the marketing term

5. Short-chain fatty acids (SCFAs) like butyrate are produced when gut bacteria ferment fibre. What is butyrate's main role?

1. Breaking down proteins in the small intestine
2. Carrying nutrients through the bloodstream to the liver
3. Serving as the primary energy source for colon cells (colonocytes) and reducing inflammation in the gut
4. Triggering hunger signals in the brain to control appetite

6. The gut-brain axis is the bidirectional communication between the gut and the brain. Which nerve is the primary physical pathway of this communication?

1. The phrenic nerve
2. The sciatic nerve
3. The trigeminal nerve
4. The vagus nerve

7. The gut is sometimes called the 'second brain.' How many neurons does the enteric nervous system (in the gut) contain?

1. About 10,000
2. About 100 million to 500 million
3. About 100,000
4. About 5 billion

8. Irritable Bowel Syndrome (IBS) is a common gut disorder. What are its hallmark symptoms?

1. Blood in the stool, weight loss, and fever
2. Recurrent abdominal pain related to bowel movements, with altered stool frequency or form — without structural damage to the gut
3. Severe heartburn, difficulty swallowing, and regurgitation
4. Yellow skin and eyes, dark urine, and pale stools

9. Fibre is essential for gut health. What is the recommended daily fibre intake for adults in most health guidelines?

1. 15–20g per day
2. 25–30g per day
3. 40–50g per day
4. 5–10g per day

10. Helicobacter pylori (H. pylori) is a bacterium that lives in the stomach. What condition is it strongly linked to?

1. Colorectal cancer
2. Crohn's disease
3. Irritable bowel syndrome
4. Peptic ulcers and stomach cancer

11. Which two major conditions fall under the umbrella of Inflammatory Bowel Disease (IBD)?

1. Coeliac disease and lactose intolerance
2. Crohn's disease and ulcerative colitis
3. Gastritis and peptic ulcers
4. IBS and diverticulitis

12. Coeliac disease is an autoimmune condition triggered by which protein?

1. Casein (in dairy)
2. Fructose (in fruits and some vegetables)
3. Gluten (in wheat, barley, and rye)
4. Lactose (in milk products)

13. What is the 'gut microbiome diversity' and why is it important?

1. The ability of the gut to digest a wide variety of food types
2. The balance between harmful and beneficial bacteria in the gut
3. The total number of bacteria in the gut, regardless of species variety
4. The variety of different microbial species in the gut — greater diversity is generally associated with better health

14. Acid reflux (GERD) occurs when stomach acid flows back into the oesophagus. Which muscle failure causes this?

1. The diaphragm contracting too strongly, squeezing the stomach
2. The lower oesophageal sphincter (LES) failing to close properly after food passes into the stomach
3. The pyloric sphincter (between stomach and small intestine) relaxing incorrectly
4. The stomach producing too little acid to activate the digestive process properly

15. The small intestine is the primary site of nutrient absorption. Approximately how long is the small intestine in adults?

1. About 1 metre (3 feet)
2. About 10 metres (33 feet)
3. About 3 metres (10 feet)
4. About 6-7 metres (20 feet)

16. Antibiotics can disrupt the gut microbiome. What is the main concern with taking broad-spectrum antibiotics unnecessarily?

1. They cause permanent damage to the pancreas, reducing digestive enzyme production
2. They directly damage the stomach lining and cause ulcers
3. They kill both harmful and beneficial bacteria, reducing microbiome diversity — with effects that can last months to years
4. They make the gut wall permeable, allowing bacteria to enter the bloodstream

17. What does the liver produce that is essential for fat digestion, stored in the gallbladder?

1. Amylase
2. Bile
3. Hydrochloric acid
4. Lipase enzyme

18. The FODMAP diet is used to manage IBS symptoms. What does FODMAP stand for?

1. Fermentable Oligosaccharides, Disaccharides, Monosaccharides And Polyols
2. Fermented Organic Dairy, Meat, And Plant foods
3. Fibre-Only Diet with Minimal Animal Proteins
4. Foods Offering Digestive Microbial And Probiotic balance

19. The appendix was long thought to be a vestigial (useless) organ. Current thinking suggests it may:

1. Act as a second stomach for storing partially digested food
2. Filter toxins from the blood before they reach the large intestine
3. Produce digestive enzymes for breaking down cellulose from plant foods
4. Serve as a backup reservoir of beneficial gut bacteria that repopulate the colon after illness

20. What is 'leaky gut' (intestinal permeability), and is it an established medical diagnosis?

1. A completely fabricated condition with no scientific basis whatsoever
2. A described physiological phenomenon (increased intestinal permeability) with some scientific evidence, but not a formal medical diagnosis in mainstream medicine
3. A formal ICD-10 medical diagnosis referring to Crohn's disease in its active phase
4. A recognised medical diagnosis referring to diverticulitis — small pouches developing in the colon wall