it is definitely not as simple as eating more broccoli... but... http://jama.jamanetwork.com/article.aspx?articleid=200073 http://www.sciencedirect.com/science/article/pii/0306987780900109 http://ajcn.nutrition.org/content/85/6/1586.short http://www.sciencedirect.com/science/article/pii/0304383585901594 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3252704/ i could post ten pages of similar research. you simply cannot discount the importance of balanced intake of vitamins and minerals. as well as protective properties of certain foods. am i suggesting that spinach will cure all cancers? no, of course not. but a lot of the preventive measures can be done by maintaining healthy eating habits. .. and people are grossly misinformed about nutrition. (i.e. consuming low-calories drinks like diet coke is not healthy... eating a salad with chemical dressing and veggies at mcd's is not healthy, a glass of juice with 45 grams of sugar is not healthy.. etc. etc.) if we know one thing about cancer is that it is caused by mutations or dis-balance. a lot of such disbalance is caused by what we eat. our body doesn't have anything else to work with. as soon as you introduce salt which has 95% sodium + bleach instead of a balanced, unprocessed salt which has just the right ratios of minerals, some tiny variance is introduced. as u keep having uncertainty, it multiplies, right? so predicting the effects of such disbalances get infinitely more difficult. and while we may not know the exact mechanisms, it would be silly as a scientist to dismiss the notion of proper eating habits having a very strong correlations with cancer. if anything this should prompt more interest and research. finally from american cancer society: http://www.cancer.org/cancer/cancercauses/dietandphysicalactivity/diet-and-physical-activity 33% is a pretty significant figure, wouldn't you agree?