Medical Terms

Prebiotic vs. Probiotic: What are the Differences?

When we explore the realm of gut health, two terms frequently surface: prebiotics and probiotics. Though they sound similar, they play quite different roles in supporting our digestive health. 

The Main Difference between Prebiotic and Probiotic

  • Prebiotics are fibers that feed the beneficial bacteria in our gut.
  • Probiotics are live bacteria that can offer health benefits when consumed.
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Prebiotic vs. Probiotic: Definition

What Are Prebiotics?

Prebiotics are compounds in food that induce the growth or activity of beneficial microorganisms such as bacteria and fungi. They are a type of dietary fiber that the human body cannot digest. Found in many fruits, vegetables, and whole grains, prebiotics act as food for probiotics, fostering a healthy environment in our gut.

  • Sources of Prebiotics: Examples include bananas, onions, garlic, leeks, asparagus, artichokes, and whole-grain foods.
  • Benefits: By stimulating the growth of beneficial bacteria, prebiotics help improve gastrointestinal health, enhance calcium absorption, and may even boost our immune function.

What Are Probiotics?

Probiotics, on the other hand, are live microorganisms that provide health benefits when consumed, generally by improving or restoring the gut flora. These beneficial bacteria and yeast are found in a variety of foods and supplements.

  • Sources of Probiotics: Common food sources are yogurt, kefir, sauerkraut, tempeh, kimchi, and kombucha.
  • Benefits: They can help balance the friendly bacteria in our digestive system, prevent diarrhea caused by infections or antibiotics, and may improve some mental health conditions.

Prebiotic vs. Probiotic: Examples

Examples of Prebiotic

  • To improve her gut health, she started adding a prebiotic supplement to her morning smoothie.
  • The nutritionist explained that asparagus is a great natural source of prebiotics.
  • Many high-fiber foods act as prebiotics by stimulating the growth of beneficial bacteria in the intestines.
  • Some studies suggest that prebiotics can help boost the immune system by promoting a healthy gut microbiome.
  • The new health drink claims to contain both probiotics and prebiotics for optimal digestive health.
  • He was advised to increase his intake of prebiotics to help manage his digestive issues.
  • The yogurt is enriched with prebiotics to make it even more beneficial for your digestive tract.

Examples of Probiotic

  • She takes a probiotic supplement daily to maintain a healthy balance of gut bacteria.
  • After his course of antibiotics, the doctor recommended a probiotic to restore his gut flora.
  • The label on the yogurt indicates that it contains live probiotic cultures.
  • He read an article about how probiotics may improve digestion and enhance the immune system.
  • The health store had a variety of probiotic drinks available in different flavors.
  • Incorporating probiotic-rich foods like kefir into your diet can be beneficial for your overall well-being.
  • Some probiotic supplements are designed to withstand stomach acid and reach the intestines where they’re most effective.
 
B1 Knowledge Check · 5 questions

Prebiotic vs. Probiotic: What are the Differences? — Practice Quiz

1 / 5
Q1

Question 1: Which sentence uses "prebiotic" correctly?

Question 1 options
"She started adding a prebiotic supplement to her morning smoothie" is correct because prebiotics are dietary fibers that feed beneficial gut bacteria, and they can be taken as supplements. The other options incorrectly describe prebiotics as live bacteria, a fermented food, or something that restores gut flora — those descriptions apply to probiotics.
Q2

Question 2: Prebiotics are live microorganisms that provide health benefits when consumed.

Question 2 options
This statement is false. Prebiotics are a type of dietary fiber that the human body cannot digest; they feed beneficial bacteria. It is probiotics that are live microorganisms providing health benefits when consumed.
Q3

Question 3: After his course of antibiotics, the doctor recommended a ___ to restore his gut flora.

Question 3 options
"Probiotic" is correct here because probiotics are live microorganisms that help improve or restore the gut flora. A prebiotic is dietary fiber that feeds bacteria, not live bacteria itself. The article specifically mentions that probiotics can help prevent diarrhea caused by antibiotics.
Q4

Question 4: Match each item to either "prebiotic" or "probiotic."

Question 4 options
Garlic
Kefir
Asparagus
Kimchi
Probiotic (contains live microorganisms)
Prebiotic (dietary fiber source)
Probiotic (fermented food with live cultures)
Prebiotic (feeds beneficial bacteria)

Select an item on the left, then tap its match on the right.

Garlic and asparagus are sources of prebiotics — they are high-fiber foods that feed beneficial gut bacteria. Kefir and kimchi are sources of probiotics — they contain live beneficial microorganisms produced through fermentation.
Q5

Question 5: Which definition best describes "prebiotics"?

Question 5 options
"Non-digestible fibers that stimulate the growth of beneficial gut bacteria" is the correct definition. The article states that prebiotics are dietary fibers the human body cannot digest and that they act as food for probiotics, fostering a healthy gut environment.

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