Can't Shake Negative Thoughts? Check Your GUT First

By Dr. Scott Olson, ND Posted July 5, 2025

Everyone struggles sometimes to stay positive or see the bright side of things. It’s part of being human.

You might think those negative thoughts start in your brain—but it’s   more complicated than that.

A simple change to your daily habit can help dial down those negative feelings.

New research suggests that this simple strategy could be a powerful tool in our mental health toolkit.

Let’s shed some light on this fascinating research…

I’ve mentioned the connection between gut health and overall wellness many times before.

The bacteria in your gut influence hormone levels and can either support or disrupt various bodily functions. So, it’s no surprise they’re tied to a laundry list of health issues ranging from high blood pressure to depression.

Now, a team of scientists has taken a deeper dive into how probiotics impact our mental health.

The study, published in npj Mental Health Research, found that daily probiotics containing common bacteria, such as Lactobacillus and Bifidobacterium, for just one month can significantly reduce negative feelings.

Wondering how the gut bacteria could possibly affect your mood? That’s a great question.

Well, it turns out our gut and brain are constantly chatting through what scientists call the “gut-brain connection.” This “conversation” happens through various routes, including the vagus nerve, immune system, and hormones.

When you take probiotics, you’re essentially sending in the good bacteria cavalry to restore order to your gut kingdom. These microscopic heroes influence your brain’s function through this gut-brain superhighway.

It’s like having tiny therapists living in your intestines, working overtime to improve your mood—for the cost of a yogurt instead of $200 an hour.

This research underscores what I’ve been saying for years: your gut health isn’t just about digestion—it’s also a major player in your mental well-being.

To improve your gut health, and potentially boost your mood, start here:

• Add fermented foods like yogurt, kefir, and sauerkraut to your diet
• Choose probiotic supplements containing Lactobacillus and Bifidobacterium
• Eat more fiber-rich foods to feed your good gut bacteria
• Cut back on processed foods and added sugars, which feed the bad bugs
• Stay hydrated to keep your digestive system running smoothly

Remember, while managing your gut health is a promising strategy for mood enhancement, it’s not a silver bullet. If you’re struggling with persistent negative feelings or depression, it’s crucial to seek professional help.

P.S. Is your gut “good”? Here’s how to check…

Source:

Johnson, K.VA., Steenbergen, L. Probiotics reduce negative mood over time: the value of daily self-reports in detecting effects. npj Mental Health Res 4, 10 (2025). DOI:10.1038/s44184-025-00123-z

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 By Dr. Scott Olson, ND