Newly discovered evidence raises questions about the effectiveness of probiotics.

An impressive amount of research in the past decade has revealed that probiotics – beneficial bacteria residing in the body that promote better health – play a crucial role in aiding digestion and supporting the function of various organs.

Due to the diverse range of bacteria inhabiting different parts of our bodies, scientists are only just beginning to understand the functions of many of these microscopic organisms.

Recently, Dr. Lorenzo Cohen, who leads the Integrative Medicine Program at the University of Texas MD Anderson Cancer Center in Houston, raised doubts about the benefits of probiotic supplements, suggesting they may have negative effects.¹

The question arises: are probiotics helpful or harmful?

Prior to voicing his concerns, Dr. Cohen had been diagnosed with melanoma, a fatal type of skin cancer. Aware of research indicating that individuals with a greater variety of probiotic bacteria in their intestines respond better to cancer treatment, he had endeavored to enhance the diversity of healthy bacteria in his own digestive system.

Over six months, he adhered to a diet aimed at improving his bacterial diversity.

Describing his diet, he:

• Incorporated more fermented foods rich in probiotic bacteria.
• Eliminated refined carbohydrates – cutting out white rice, white flour, and other processed foods.
• Reduced consumption of whole grains.

However, according to Dr. Cohen, the diet had an adverse effect. Analysis of the bacteria in his gut revealed that the diversity of probiotic flora had actually decreased after six months.

Furthermore, he contends that research at MD Anderson Cancer Center aligns with his experience – indicating that taking a probiotic supplement might diminish a patient’s response to cancer treatment through immunotherapy.² It is worth noting that Dr. Cohen did not consume a supplement but rather ate fermented foods.

Reasonable Conclusions?

Given Dr. Cohen's personal observations and statements, what conclusions can be drawn?

It is important to recognize that the experience of one individual does not establish a new scientific truth. Factors such as concurrent chemotherapy treatment could have influenced the outcome.

An expert in the supplement industry highlights that Dr. Cohen's diet may have been unsuccessful due to the reduction of prebiotics – fibrous foods known to provide nutrients for probiotic bacteria in the gut.

It is reasonable to assume that consuming fewer prebiotics could result in a lower survival rate of intestinal probiotics in the body. Prebiotic sources include fruits, vegetables, and fiber-rich whole grains.³

Dr. Cohen himself supports the concept of prebiotics, suggesting that a diet rich in these bacteria-friendly foods can sustain the natural microbiome in the colon.

The premise is that even if the native bacteria in the colon have been depleted by excessive antibiotic use or yeast overgrowth, there are still beneficial strains present in the intestines that can thrive with the right support.

Studies Contradict Cohen’s Critique of Probiotics