For many years, the perception that coffee can cause cancer of the pancreas, colon and rectum, but recent biochemical studies have refuted this claim and confirmed the results of epidemiological studies. Experts of the research center of NESTLÉ (Switzerland) c. Cavin et al.  in animal and human cells have shown that coffee derivatives possess anticarcinogenic properties and reduce the activity of certain carcinogens due to increased antioxidant protection and suppression of the activation of carcinogens. The findings substantiated biochemists large epidemiological studies.
Italian scientists a. Tavani et al.  examined the relationship between coffee and tea consumption and the risk of developing cancer of the rectum and large intestine in patients and 7057 3530 persons in the control group. A statistically significant link between coffee consumption and the risk of developing colon cancer is not established; on the contrary, it turned out that coffee protects from the disease through consumption of three cups or more per day.
It is known that the Swedes are the biggest consumers of coffee in the world per capita. K. Michels et al.  examined the relationship between consumption of coffee, tea, caffeine and breast cancer among 59036 Swedish women aged 40 to 76 years, mammography screening. The study showed no relationship between drinking coffee with the frequency of breast cancer.
Due to the randomized analysis of 17 studies of colon cancer in a dozen countries, conducted by Harvard University, found that the risk of cancer in people who consume four or more cups of coffee, 25% lower than that of those coffee drinkers rarely or never drinks it.
Coffee and in the CENTRAL NERVOUS SYSTEM
What coffee beneficial effect on the central nervous system, improves mental and physical performance, improves health, is known for a long time. Research of the last decade have revealed another interesting effect of coffee on the human body. I. Kawashi et al.  examined the relationship between coffee consumption and the incidence of suicide among women for ten years in a prospective study among 86625 nurses aged 34 to 59 years without ischemic heart disease, stroke or cancer. Use the gradation of frequency of consumption of coffee: sometimes; 1-3 cups per month; 2-4 cups per week; from 5-6 cups a week up to 1 cup a day; 2-3 cups a day; 4-6 cups a day and more than 6 cups a day.
The results of the study showed that in people, coffee drinkers, the risk of suicide than those who do not drink coffee with increasing doses, the risk is reduced. This trend remained unchanged after taking into account factors such as smoking, alcohol use, drug use, marital status and stress.
It turned out that for women who use coffee, have higher levels of stress, including fewer cases of hypertension, diabetes, hypercholesterolemia, they are less inclined to take such drugs as phenothiazine, diazepam, cimetidine and methyldopa.
Inverse correlation between daily coffee consumption and the risk of suicide is revealed during the 8-year-old monitoring 128934 by the Kaiser’s ongoing programme on health .
The beneficial effects of coffee on the central nervous system and, accordingly, the mood and the performance of the jobs examined c. Bricee et al.  in a double blind placebo controlled trial. The test subjects drank a coffee, containing 65 mg of caffeine, or CSC, then in the range of 1-4 hours were evaluated for their effectiveness. According to the researchers, caffeine increases concentration improves the performance of simple or cognitive tasks that require a complex approach and selection decisions.