
Mailbag! Strange Beverage BOOSTS Your Immune System!
I’ve been hearing a lot about kefir and that it’s good for your gut. Then recently I heard it can help your lungs too. Is there anything to it?
–Thelma from Kent, Connecticut
Hi Thelma,
You’re right— kefir is a hot topic lately.
Kefir is a fermented yogurt drink that you used to only see in health food stores, but now you can find it almost anywhere (I’ve even seen it in gas stations!).
People mix kefir into their smoothies or drink it straight.
While kefir has the normal nutritional value of any dairy product, it also contains much-needed probiotics to keep your gut bacteria (microbiome) happy.
But that’s not all.
Researchers have found that kefir naturally stimulates our immune system, specifically when it comes to our lungs.
One study found that it increases immune cells called immunoglobulins (IgA) while ALSO helping macrophages (a type of lung cell) gobble up foreign invaders.
So… should you try kefir?
The answer is yes! One of the things we’re missing most in our modern diet is healthy bacteria that help support our digestive health.
If you lived in a preindustrial society, you’d be putting bacteria in your gut all the time.
Think about pulling a carrot out of the ground and eating it right away without washing it. You’d get all sorts of probiotics—in fact, many of the bacteria in our guts are the same ones found in the soil.
That’s why I suggest people eat yogurt, kefir, and other fermented foods like sauerkraut as much as possible.
And to protect your gut even more, here are some additional tips.
Dr. Scott’s Road to Microbiome Mastery:
- Stay away from antibiotics unless you absolutely need them.
- Eat fermented foods, including sauerkraut, pickles, yogurt. (And for the adventurous: miso, natto, and kimchi).
- Take a good probiotic. I personally like to rotate probiotics to get a wide variety of bacteria species.
- Eat plenty of fiber prebiotics. Probiotics need food, and fiber is one of the best ways to feed them. Fresh raw vegetables are your best source of prebiotic fiber.
P.S. Have a health concern that’s worrying you? Click to submit your questions and get featured in the weekly mailbag!

Written By Dr. Scott Olson, ND
Nearly 25 years ago, failed mainstream medical treatments left Dr. Olson in constant pain – and his health in ruins. And that’s when he did something REVOLUTIONARY. He began his career in medicine – and dedicated his life to uncovering the true, underlying causes of disease.
Through his innovative medical practices in Tennessee and Colorado, Dr. Olson has helped cure countless seniors from across America of arthritis… heart disease… diabetes… and even cancer. All without risky prescription drugs or painful surgeries.
View More Free Articles
Eat 23 of These Daily to SLASH Heart Risk [DELICIOUS!]
When it comes to heart health, we’re constantly told what we need to cut out. You know the drill—ditch the salt, dump the sugar, and avoid the processed foods. But what if I told you that adding something to your diet could be just as effective for protecting your heart? A comprehensive new scientific analysis...
"Yellow Devil" Fruit CRUSHES Blood Pressure Better Than Meds
I have a confession to make. I hate bananas. Even the smell of them causes my stomach to flip. The funny thing is that I have an uncle and a daughter who are the same—so I wonder if it’s genetic. But even though I consider them the yellow devil of the fruit world, I recommend...
50-Cent Nutrient Puts the Brakes on Aging
Scientists discovered a remarkable “anti-aging” solution hiding in plain sight. It isn’t some exotic compound from a remote rainforest or an expensive laboratory creation. It’s a nutrient you can find at any pharmacy for less than the cost of a cup of coffee. The trouble is, most seniors aren’t getting enough of it, which researchers...
The Hidden Brain Risk Lurking in Your Living Room
If you’re reading this while settled into your favorite chair, you might want to consider standing up… New research uncovered something that might surprise you. Sitting too much can literally shrink your brain. But it gets worse… We all know being sedentary isn’t good for our health. However, researchers at Vanderbilt University uncovered something alarming....
“Biohack” Your Life Like a Billionaire?! Here’s How
You’ve probably seen the headlines about the billionaire who spent millions on “biohacking” to try to make himself younger. He measures hundreds of biomarkers and pops dozens of pills daily. And he’s undergoing experimental treatments that cost more than most folks’ houses. It may have left you wondering if regular people like you and I...
Do THIS Daily to Improve Strength, Flexibility, and Endurance
For any couch potatoes out there… I have some exciting news. If you’ve been avoiding exercise because you hate the gym or don’t have the time, that might be about to change. A groundbreaking study reveals how a few simple moves, done daily in your own home, could dramatically improve your fitness—even if you’ve skipped...
Mailbag: A Post-Prostate Cancer Blueprint for a Better Recovery
“My son just got his prostate removed because of cancer. He is doing well and recovering. My question is there any information you can forward with regards to his lifestyle? Are there things he should not eat, things he should be eating, is social drinking a risk, any vitamins that should be on his list?...
The Stroke-Boosting Threat Lurking in YOUR Arteries
We want to take a moment on this Memorial Day to honor the brave men and women who made the ultimate sacrifice in service to our nation. Their courage, dedication, and selfless commitment to protecting our freedoms will never be forgotten, and their legacy lives on in the country they helped preserve. I’ve warned you...
20-Minute AM Hack Will Revolutionize How You Wake Up
If you feel like you’re in a fog for the first hour after your alarm goes off, you’re not alone. Mornings can be rough. That groggy, disoriented feeling isn’t just annoying—it’s a real physiological phenomenon called “sleep inertia.” And it can drag on for up to two hours after waking, even if you’ve had a...
Weekly Habit QUINTUPLES Your Cancer Risk
Everyone knows that sugar-sweetened sodas aren’t going to win any nutrition awards. That’s not news. But now, a disturbing new study suggests these soft drinks hide a deadly secret. A regular soda habit could do far more damage than just expand your waistline or raise your diabetes risk. The new research reveals these sugary treats...