Nuts and Seeds Helps in Fighting Cancer 

Flax Seeds Are a Rich Source of Lignans, Which May Reduce Cancer Risk 

Lignans are plant compounds that have antioxidant and estrogen properties, both of which can help lower the risk of cancer and improve health. 
Interestingly, flax seeds contain up to 800 times more lignans than other plant foods . 
Observational studies show that those who eat flax seeds have a lower risk of breast cancer, particularly postmenopausal women . 
Additionally, according to a Canadian study involving more than 6,000 women, those who eat flax seeds are 18% less likely to develop breast cancer . 
However, men can also benefit from eating flax seeds. 
In a small study including 15 men, those given 30 grams of flax seeds a day while following a low-fat diet showed reduced levels of a prostate cancer marker, suggesting a lower risk of prostate cancer . 
Flax seeds also appeared to have the potential to prevent colon and skin cancers in laboratory and animal studies. Yet, more research is needed to confirm this. 
Nevertheless, the evidence thus far points to flax seeds being a potentially valuable food in the fight against various cancers. 

Berries 

Berries are rich in vitamins, minerals, and dietary fibers. Scientists have shown a lot of interest in berries due to their antioxidant properties and potential health benefits. 
One study shows that anthocyanin, which is a compound in blackberries, lowers biomarkers for colon cancer. 
Another study demonstrates that the anti-inflammatory effects of blueberries can prevent the growth of breast cancer tumors in mice 

Walnuts 

According to the American Institute for Cancer Research, all nuts exhibit cancer-preventing properties, but scientists have studied walnuts more than other types of nut. 
Walnuts contain a substance called pedunculagin, which the body metabolizes into urolithins. Urolithins are compounds that bind to estrogen receptors and may play a role in preventing breast cancer. 
In one animal study, mice receiving whole walnuts and walnut oil had higher levels of tumor-suppressing genes than the mice receiving vegetable oil.