New research confirms previous studies that fiber and probiotics can reduce the risk of cancer. In this (human in vivo) study they found that the risk of coming down with lung cancer was reduced by 33% in the group consuming high fiber and yogurt (compared to the group that consumed the least of these).

This research looked at the results of 10 prospective cohorts that included a total of 1,445,850 adults. What they found was that both yogurt and fiber were inversely associated with lung cancer. In their conclusion they found that both probiotics and prebiotics were highly protective against lung cancer.

The topic of improving the gut’s microbiome is covered extensively in Cancer – Improving Your Odds. It is clear that having a gut with lots of beneficial bacteria, and plenty of diversity, is very important to our immune system’s ability to fight cancer.

The following quote comes from a study that appears in Cancer – Improving Your Odds

“Given that the enhanced anti-melanoma effect from Bifidobacterium species had occurred at the innate immunity level, the authors anticipated that Bifidobacterium species also provide anti-tumor beneficial effects to other types of tumors” — PubMed ID#PMC5845387 (2018)

In other words, bifidobacterium (a common probiotic bacteria) can provide anti-tumor benefits against many types of cancer. There are several more such examples in the book.