Food therapy - Black beans (Phaseolus) and Colon Cancer

Black bean is a Small roughly ovoid legumes with glossy black shells, genus Phaseolus, belongs to the family Fabaceae and can bought in most grocery stores all around the year in dried and canned forms. It is believed that black bean was first domesticated growth in South America.
Cancer is a class of diseases in which a group of cells growing and multiplying disordered and uncontrollable way in our body, have become progressively worse and damaged other healthy tissues, sometimes spreads to other organs in the body via lymph or blood and results may be in death.
Colon Cancer is defined as a condition of the abnormal proliferation of cells in the colon.

Nutrients and Chemicals constituents
a. Nutrients
1. Carbohydrate
2. Dietary fiber
3. Protein
4. Fat
5. Vitamin A
6. Vitamin B
7. Folate
8. Vitamin C
9. Calcium
10. Magnesium
11. Manganese
12. Phosphorus
13. Molybdenum
14. Iron
10. Etc.
b. Chemicals constituents
The major chemical compounds of black bean include anthocyanin, (-)-epicatechin, delphinidin, petunidin, flavonols  and malvidin.

The benefits
Through human history. black bean has been used as major sources of food consumption as well as
a food in preventing and treating. in TCM black bean is considered as a sources to enhance liver to produce and regulate the circulation of blood. Flavonoids, Genistein and saponins found in black bean has exert the antioxidant capacity and antiproliferative activity against cancer cell lines as Genistein was related with the activity against mammary cancer cells but flavonols and group B saponins were more related with hepatic and colon cancers. Non-glycosilated flavonols were related with antioxidant capacity. In other study, black bean is found to  reduce azoxymethane-induced colon cancer in rats, Dr. Hangen L and the research team said that total tumor multiplicity was also significantly lower in rats fed the black bean (1.1) and navy bean (1.0) diets than in rats fed the control diet (2.2). The 44-75% reduction in colon carcinogenesis in rats fed beans was attributed to 1) more controlled appetites, leading to significantly less body fat, and 2) much greater concentrations of butyrate in the distal colon. It was concluded that eating black beans and navy beans significantly lowered colon cancer incidence and multiplicity.

The Side effect
1. Purines
Black beans contain purines, excessive intake of these substances can cause the accumulation of uric acid, leading to"gout" and kidney stones.
2. Etc.
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References
(1) Differential accumulation of polyphenolics in black bean genotypes grown in four environments.

Marles MA, Balasubramanian P, Bett KE. (PubMed)

(2) Evaluation of the antioxidant and antiproliferative activities of extracted saponins and flavonols from germinated black beans (Phaseolus vulgaris L.).

Guajardo-Flores D, Serna-Saldívar SO, Gutiérrez-Uribe JA(PubMed)

(3) Consumption of black beans and navy beans (Phaseolus vulgaris) reduced azoxymethane-induced colon cancer in rats. by Hangen L, Bennink MR.(PubMed)