We are trying to crack the code to healthy weight loss and easy weight management that simultaneously contributes to our overall health, without the use of extreme or fad diets.
And we may have found something special.
Probiotics for weight loss
Probiotics refer broadly to the beneficial bacteria that populate our guts and make up our “gut microbiome”.
If these beneficial bacteria can help us manage and maintain a healthy weight, that is a huge game changer for our health.
Our microbiome is responsible for a myriad of functions, including such heavy hitters as properly digesting our food and helping to extract all the vital nutrients found in them, to signaling to our brains via the gut-brain axis, to being a massive part of our immune systems.
Frankly, when you look at the list of things that our microbiome helps us with, weight management might be one of its least impressive benefits.
And, given all of the other benefits of a healthy gut microbiome and how it impacts our overall health, it certainly does seem intuitive that it would positively effect our body weight in turn.
Let’s look at the science of probiotics and weight loss
Fortunately for us, the research into this area is one of the more highly studied areas of dietary-based weight management interventions.
And the results so far are very good.
According to a slew of meta-analyses (all linked in the footnotes below this article). Let’s take a look at some of these analyses:
- A meta-analysis published in 2018 found that probiotic supplementation resulted in a significantly larger reduction in body weight, BMI, and fat percentage compared to placebo. [1]
- A meta-analysis published in 2021 found that probiotics could lead to significant weight reductions.[2]
- A meta-analysis published in 2022 found that probiotic supplementation resulted in significant reductions in body weight, BMI, fasting glucose, insulin, and insulin resistance in study subjects with PCOS. [3]
- A meta-analysis published in 2025 found that probiotic supplementation resulted in significantly greater weight loss as well as significantly greater reductions in waist circumference and visceral fat than those in control groups.[4]
- A meta-analysis published in 2021 found that in 14 of 23 studies analyzed, probiotics played a role in reducing body weight, BMI, visceral fat, as well as waist and hip circumference.[5]
- A meta-analysis published in 2025 found that probiotic and synbiotic supplementation resulted in a significant decrease in body weight, waist circumference, total cholesterol, triglycerides, fasting glucose, and insulin levels while increasing HDL cholesterol in patients with metabolic syndrome.[6]
- A meta-analysis published in 2021 found that probiotic supplementation resulted in a significant decrease in body weight, BMI, waist circumference, fat mass, tumor necrosis factor-α, insulin, total cholesterol, and LDL cholesterol when compared to control groups. These observations were only observed when supplementation was at least 10 billion CFU and at least for eight weeks duration.[7]
- A meta-analysis published in 2022 found that probiotic supplementation along with dietary interventions resulted in enhanced weight loss and reductions in fat mass when compared to dietary interventions alone.[8]
- A meta-analysis published in 2018 found that both probiotic and prebiotic supplementation resulted in significant decreases in body weight, BMI, and fat mass when compared to placebo.[9]
- A meta-analysis published in 2013 observed that, among studies analyzed, increase in bifidobacteria was usually accompanied by weight loss.[10]
- A meta-analysis published in 2016 found that yogurt, high in probiotics, is associated with lower body weight, lower body fat, and smaller waist circumference.[11]
- A meta-analysis published in 2022 found that probiotic supplementation resulted in significant decreases in both visceral fat and subcutaneous fat. Regarding visceral fat, the researchers found single bifidobacterium and single lactobacillus probiotics to result in visceral fat reduction, but not when combined. Regarding subcutaneous fat, single lactobacillus and mixed probiotics showed a significant reduction, but single bifidobacterium showed no effect.[12]
Wow.
That was a mouthful.
And perhaps more evidence of just how important the microbiome is.
So while ensuring you are consuming an appropriate amount of probiotics appears to have great potential in maintaining a healthy weight, it is likely important to look at this as just one potential tool in our health toolboxes.
And if we use enough of them, we might just find ourselves with the healthy bodies we’ve always wanted, without resorting to fad or restrictive diets that typically are not sustainable anyway.
How do we get more probiotics to our digestive system?
Now, when we talk about probiotics, again we are talking about beneficial bacteria. And we can introduce that beneficial bacteria in a couple of ways. One is by supplementation, and the other is via consuming certain fermented foods that contain probiotics, like high-quality yogurts, kefirs, and fermented vegetables like kimchi or sauerkraut.
With that said, not all supplements and not all probiotic-containing foods are made the same.
Quality is hugely important here.
For instance, some commercial yogurts, sauerkrauts, etc. are made with perhaps little to not beneficial bacteria available to consume. Others, on the other hand, are chock full of them.
My advice would be to read labels carefully.
Make sure these foods are prepared simply, with no additive or preservatives. Foods like yogurt and kefir should list the bacteria used in their preparation.
You should also put the rest of your diet through the same test.
Many additives and preservatives are very hostile to your gut microbiome. A whole foods-based diet can help amplify your overall health, part of which is helping to feed your healthy microbiome, allowing it to then do the good things it does to amplify your health.
Yet another reason why adopting a whole foods-based diet is the number one thing you can in terms of nutrition for your health.
But with that said, the real powerhouse here may be the probiotic supplements.
Probiotic supplements are unique to the probiotic foods in that they can contain far more strains of beneficial bacteria and in great numbers.
There is some debate, however, as to whether or not the beneficial bacteria found in these foods and supplements are able to survive the digestive process to reach your gut and populate your microbiome.
In response to that, many supplement makers use different processes to ostensibly ensure the bacteria make it through that journey.
I am not here to make the call on which of those processes work or not, whether or not they are even necessary, or whether or not you should take a supplement at all. But I will say it is something to consider and talk to your licensed healthcare practitioner about.
As I will also advise you should do regarding any changes you want to make to your diet or healthcare plans, in order to make sure what you are doing is safe and appropriate for you.
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The opinions expressed herein are for informational and educational purposes only and are not intended as a substitute for professional medical advice, diagnosis and treatment. Please consult a physician or health care professional for your specific health care or medical needs.
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References
[1] https://pubmed.ncbi.nlm.nih.gov/29047207/
[2] https://pubmed.ncbi.nlm.nih.gov/34684633/
[3] https://pubmed.ncbi.nlm.nih.gov/31165401/
[4] https://pubmed.ncbi.nlm.nih.gov/39984625/
[5] https://pubmed.ncbi.nlm.nih.gov/33459204/
[6] https://pubmed.ncbi.nlm.nih.gov/40348630/
[7] https://pubmed.ncbi.nlm.nih.gov/34358838/
[8] https://pubmed.ncbi.nlm.nih.gov/36530587/
[9] https://pubmed.ncbi.nlm.nih.gov/29547587/
[10] https://pubmed.ncbi.nlm.nih.gov/23889619/