14 Dec 2018 --- Excess body weight was responsible for roughly 4 percent of cancers worldwide in 2012, and that number is likely to rise, an American Cancer Society peer-reviewed study has found. The report says that calorific, nutrient-poor food and physically inactive lifestyles are driving up the percentage of overweight people worldwide and promoting noncommunicable diseases, including cancer. By contrast, smoking and infection-related cancers, on the other hand, have reached a plateau or decreased in prevalence.