Colorectal cancer is the third most common cancer worldwide and a leading cause of cancer-related deaths1 . Recent research suggests that regular yogurt consumption may help reduce the risk of certain types of colon cancer by promoting a healthy gut microbiome2 . People who consume two or more servings of yogurt per week have been shown to have lower rates of proximal colon cancer, especially tumors positive for beneficial bacteria such as Bifidobacterium2 3.
Yogurt and Colon Cancer Risk Connection
Colorectal cancer (CRC) remains a significant global health challenge, with diet playing an important role in its development1 . Epidemiologic studies have increasingly focused on the relationship between yogurt intake and colorectal cancer incidence, given yogurt’s probiotic content and its potential to modulate gut health4 5.
Large prospective cohort studies, including the Nurses’ Health Study (NHS) and the Health Professionals Follow-Up Study (HPFS), have tracked tens of thousands of participants over decades, collecting detailed dietary data on yogurt consumption6 4. These studies confirmed colorectal cancer cases and subclassified tumors by characteristics such as the presence of Bifidobacterium, a genus of probiotic bacteria thought to have tumor-suppressive effects7 8.
“Our study provides unique evidence about the potential benefit of yogurt. My lab's approach is to try to link long-term diets and other exposures to a possible key difference in tissue, such as the presence or absence of a particular species of bacteria. This kind of detective work can increase the strength of evidence connecting diet to health outcomes.”
— Shuji Ogino2
Key findings from these cohorts include:
- Yogurt intake was associated with a reduced risk of colon cancer in age-adjusted analyses, particularly for proximal colon cancer located on the right side of the colon6 4.
- People who consumed two or more servings of yogurt per week had about a 20% lower incidence of Bifidobacterium-positive proximal colon cancer2 8.
- Approximately one-third of colorectal cancer tumors were positive for Bifidobacterium, suggesting a specific protective effect of yogurt against this tumor subtype7 9.
💡 Did You Know?
Long-term yogurt consumption may protect against colorectal cancer through changes in the gut microbiome. People who consumed two or more servings of yogurt per week had lower rates of proximal colorectal cancer positive for Bifidobacterium2 .
The gut microbiome plays a critical role in colorectal carcinogenesis by influencing inflammation and maintaining gut barrier integrity10 . Probiotic-rich foods like yogurt may help balance gut bacteria, reduce intestinal inflammation, and prevent dysbiosis (microbial imbalance), all of which are implicated in colon cancer development5 10.
Yogurt contains live microorganisms called probiotics that help to balance the bacteria in your digestive system. Probiotics can reduce inflammation in the intestines, ease irritable bowel syndrome symptoms, stimulate the growth of beneficial bacteria in the gut, and improve nutrient absorption16 .
However, it is important to note that these findings come from observational studies, which cannot definitively establish causality. Limitations include reliance on self-reported dietary data, which may introduce measurement errors, and study populations predominantly of European descent, which may limit generalizability4 11.
Despite these limitations, meta-analyses of multiple observational studies have reported that higher yogurt consumption is associated with a modestly reduced risk of colorectal cancer overall, with odds ratios ranging from 0.87 to 0.91 for high versus low yogurt intake12 13.
| Study Cohort | Participants | Follow-up Years | Key Finding on Yogurt and CRC Risk |
|---|---|---|---|
| Nurses’ Health Study (NHS) | 83,054 women | 32 | Yogurt intake linked to reduced proximal colon cancer risk6 4 |
| Health Professionals Follow-up Study (HPFS) | 43,269 men | 26 | Similar protective association observed6 4 |
| Meta-analysis of 16 studies | Various | N/A | Yogurt consumption associated with 13% lower CRC risk overall12 13 |
“This paper adds to the growing evidence that illustrates the connection between diet, the gut microbiome, and risk of colorectal cancer. It provides an additional avenue for us to investigate the specific role of these factors in the risk of colorectal cancer among young people.”
— Andrew T. Chan2
Benefits of Increasing Yogurt Intake
Yogurt is a nutrient-rich fermented dairy product containing live microorganisms called probiotics that help balance the bacteria in the digestive system14 15. These probiotics can reduce intestinal inflammation, ease digestive symptoms, stimulate growth of beneficial gut bacteria, and improve nutrient absorption16 .
Regular consumption of yogurt supports a healthy gut microbiome, which is crucial for maintaining gut barrier integrity and preventing chronic inflammation linked to colon cancer5 103. A strong gut barrier prevents harmful substances from entering the bloodstream and triggering inflammatory responses that may promote tumor development3 .
Additional health benefits of yogurt include:
Eating yogurt regularly may reduce the risk of colon cancer. People who regularly ate two or more servings of yogurt a week had lower rates of certain types of colorectal cancer. Habitual yogurt eaters had lower rates of Bifidobacterium-positive proximal colon cancers. The bacteria in yogurt promote an overall healthy balance of bacteria in the gut and promote a strong and healthy gut barrier. When the gut barrier becomes too permeable, it can lead to inflammation and increase the risk of colon cancer3 .
- Supporting weight management by promoting feelings of fullness and reducing cravings16 14.
- Reducing LDL (bad) cholesterol and belly fat, which are risk factors for cardiovascular disease16 .
- Providing essential nutrients such as calcium, protein, vitamins B2 and B12, potassium, and zinc that support bone health, immune function, and metabolism14 15.
- Lowering risk of Type 2 diabetes, osteoporosis, and cardiovascular disease17 83.
- Helping regulate metabolism and potentially aiding in weight loss16 .
“It has long been believed that yogurt and other fermented milk products are beneficial for gastrointestinal health. Our new findings suggest that this protective effect may be specific for Bifidobacterium-positive tumors.”
— Tomotaka Ugai2
Eating two or more servings of yogurt per week has been linked to lower rates of aggressive colon cancer, particularly Bifidobacterium-positive proximal colon cancer, which tends to have worse survival outcomes than distal colon cancers2 173.
Experts encourage including yogurt as part of a balanced diet:
“Yogurt may be good for maintaining a good microbiome in our body. My message is, if you like yogurt, go for it.3
“It builds on the evidence that yogurt may be protective. These are the common denominators across culinary traditions and healthy eating.”
— Chris Damman, University of Washington3
