Gut Health & Digestion Quiz

Question 1

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

Accepted Answer

Trillions (about 38 trillion)

Answer

Millions (about 10 million)

Answer

Billions (about 100 billion)

Answer

Tens of trillions (about 100 trillion)

Question 2

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

Accepted Answer

Absorbing water and electrolytes from undigested food, and housing gut bacteria that ferment fibre

Answer

Breaking down proteins with digestive enzymes

Answer

Producing bile to emulsify fats

Answer

Absorbing most nutrients from food

Question 3

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

Accepted Answer

Yoghurt, kefir, kimchi, sauerkraut, and miso

Answer

White bread, pasta, and rice

Answer

All fermented foods including vinegar and pickles made with vinegar

Answer

Fruits and vegetables

Question 4

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

Accepted Answer

Prebiotics are non-digestible food components (mostly fibre) that feed and promote the growth of beneficial gut bacteria; probiotics are live bacteria themselves

Answer

Prebiotics are live bacteria supplements; probiotics are fibre supplements

Answer

Probiotics improve gut health directly; prebiotics improve gut health indirectly through the immune system

Answer

They are the same thing — probiotic is the scientific term and prebiotic is the marketing term

Question 5

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

Accepted Answer

Serving as the primary energy source for colon cells (colonocytes) and reducing inflammation in the gut

Answer

Carrying nutrients through the bloodstream to the liver

Answer

Breaking down proteins in the small intestine

Answer

Triggering hunger signals in the brain to control appetite

Question 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?

Accepted Answer

The vagus nerve

Answer

The sciatic nerve

Answer

The trigeminal nerve

Answer

The phrenic nerve

Question 7

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

Accepted Answer

About 100 million to 500 million

Answer

About 10,000

Answer

About 100,000

Answer

About 5 billion

Question 8

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

Accepted Answer

Recurrent abdominal pain related to bowel movements, with altered stool frequency or form — without structural damage to the gut

Answer

Blood in the stool, weight loss, and fever

Answer

Yellow skin and eyes, dark urine, and pale stools

Answer

Severe heartburn, difficulty swallowing, and regurgitation

Question 9

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

Accepted Answer

25–30g per day

Answer

5–10g per day

Answer

15–20g per day

Answer

40–50g per day

Question 10

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

Accepted Answer

Peptic ulcers and stomach cancer

Answer

Irritable bowel syndrome

Answer

Colorectal cancer

Answer

Crohn's disease

Question 11

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

Accepted Answer

Crohn's disease and ulcerative colitis

Answer

IBS and diverticulitis

Answer

Gastritis and peptic ulcers

Answer

Coeliac disease and lactose intolerance

Question 12

Coeliac disease is an autoimmune condition triggered by which protein?

Accepted Answer

Gluten (in wheat, barley, and rye)

Answer

Casein (in dairy)

Answer

Fructose (in fruits and some vegetables)

Answer

Lactose (in milk products)

Question 13

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

Accepted Answer

The variety of different microbial species in the gut — greater diversity is generally associated with better health

Answer

The ability of the gut to digest a wide variety of food types

Answer

The balance between harmful and beneficial bacteria in the gut

Answer

The total number of bacteria in the gut, regardless of species variety

Question 14

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

Accepted Answer

The lower oesophageal sphincter (LES) failing to close properly after food passes into the stomach

Answer

The pyloric sphincter (between stomach and small intestine) relaxing incorrectly

Answer

The diaphragm contracting too strongly, squeezing the stomach

Answer

The stomach producing too little acid to activate the digestive process properly

Question 15

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

Accepted Answer

About 6-7 metres (20 feet)

Answer

About 1 metre (3 feet)

Answer

About 3 metres (10 feet)

Answer

About 10 metres (33 feet)

Question 16

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

Accepted Answer

They kill both harmful and beneficial bacteria, reducing microbiome diversity — with effects that can last months to years

Answer

They directly damage the stomach lining and cause ulcers

Answer

They cause permanent damage to the pancreas, reducing digestive enzyme production

Answer

They make the gut wall permeable, allowing bacteria to enter the bloodstream

Question 17

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

Accepted Answer

Bile

Answer

Hydrochloric acid

Answer

Lipase enzyme

Answer

Amylase

Question 18

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

Accepted Answer

Fermentable Oligosaccharides, Disaccharides, Monosaccharides And Polyols

Answer

Foods Offering Digestive Microbial And Probiotic balance

Answer

Fibre-Only Diet with Minimal Animal Proteins

Answer

Fermented Organic Dairy, Meat, And Plant foods

Question 19

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

Accepted Answer

Serve as a backup reservoir of beneficial gut bacteria that repopulate the colon after illness

Answer

Produce digestive enzymes for breaking down cellulose from plant foods

Answer

Act as a second stomach for storing partially digested food

Answer

Filter toxins from the blood before they reach the large intestine

Question 20

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

Accepted Answer

A described physiological phenomenon (increased intestinal permeability) with some scientific evidence, but not a formal medical diagnosis in mainstream medicine

Answer

A recognised medical diagnosis referring to diverticulitis — small pouches developing in the colon wall

Answer

A completely fabricated condition with no scientific basis whatsoever

Answer

A formal ICD-10 medical diagnosis referring to Crohn's disease in its active phase