Understand your bacterial microbiome
About this idea
Discover the shocking truth: you have more bacteria cells in your body (38 trillion) than human cells (30 trillion). Learn how these microorganisms aren't invaders but essential partners that influence everything from digestion to mood.
On this page
How to get started
STEP 1
the numbers (3 minutes)
- Human cells in your body: ~30 trillion
- Bacterial cells in your body: ~38 trillion
- You're technically more bacteria than human by cell count!
- Most live in your gut (colon especially)
- Collectively weigh 2-5 pounds
- Contain 3.3 million genes (vs our 20,000)
- This community is called your 'microbiome'
STEP 2
what they DO for you (5 minutes)
- Digestion: Break down foods we can't (like fiber)
- - Produce vitamins (K, B12, others)
- - Extract nutrients from food
- - Prevent constipation
- Immune system: Train immune cells, fight harmful bacteria
- - Make up 70% of your immune system
- - Prevent infections by crowding out bad bacteria
- Brain function: Produce neurotransmitters
- - 90% of serotonin made in gut
- - Affect mood, anxiety, depression (gut-brain axis)
- - May influence decisions and behavior
- Weight management: Different bacteria affect weight
- - Extract more/less calories from food
- - Influence hunger signals
STEP 3
how IT gets disrupted (4 minutes)
- Antibiotics: Kill good bacteria along with bad
- - Take months to fully recover
- - Can permanently alter microbiome
- Diet: Sugar and processed food harm diversity
- - Fiber feeds good bacteria
- - Variety in diet = variety in microbiome
- Stress: Affects gut bacteria directly
- Environment: Overly sterile environment reduces diversity
- C-section births: Babies miss bacterial transfer from birth canal
STEP 4
how TO support your microbiome (3 minutes)
- Eat diverse, fiber-rich foods
- Fermented foods (yogurt, kimchi, sauerkraut)
- Prebiotics: Foods that feed good bacteria (onions, garlic, bananas)
- Probiotics: Live bacteria supplements (use wisely, not always needed)
- Avoid unnecessary antibiotics
- Manage stress
- Get dirty sometimes! (exposure to diverse bacteria helps)
- Remember: You're caring for trillions of tiny partners
What you’ll need
- none
Recommended resources
Progress milestones
Track your progress with these key achievements:
1
5 minutes
Understand you're more bacteria than human
2
10 minutes
Learn what microbiome does
3
15 minutes
Know how to support your microbiome
Common challenges
Every beginner faces obstacles. Here's how to overcome them:
Bacteria sound scary/dirty
Solution: Most bacteria are beneficial or neutral! You've lived with them your whole life. The harmful ones are rare. Think of them as tiny pets that help you stay healthy.
Share your progress
Celebrate your achievements and inspire others:
- • Share this perspective on health and identity
- • Improve diet based on microbiome knowledge
- • Explain gut-brain connection to others