deaths in 2018. Tracheal, bronchus, and lung cancer is the leading form of cancer deaths across most high and middle-income countries. Prevalence in countries of affluence In United States, 1,735,350 new cases of cancer will be diagnosed in 2018. Most common forms of cancer are cancer of the breast, lung, bronchus, prostate, colorectal cancer, melanoma of skin, Non-Hodgkin's lymphoma, renal cancer, thyroid cancer and liver cancer. Cancer mortality is higher among men than in women. African-Americans have the highest risk of mortality due to cancer. Cancer is also the leading cause of death in Australia. The most common cancers in Australia are prostate, breast, colorectal, melanoma and lung cancer. These account for 60% of the cancer cases diagnosed in Australia. Europe contains only 1/8 of the world population, but has around one quarter of the global cancer cases, with 3.7 million new cases each year. Lung, breast, stomach, liver, colon are the most common cancers in Europe. The overall incidences among different cancers vary across countries. About one in two Canadians will develop cancer in their lifetime, and one in four will die of the disease. In 2017, 206,200 new cases of cancer were diagnosed. Lung, colorectal, breast, and prostate cancer accounted for about half of all cancer diagnoses and deaths. Risk factors High prevalence of cancer in high-income countries is attributed to lifestyle factors like obesity, smoking, physical inactivity, diet and alcohol intake. Around 40% of the cancers can be prevented by modifying these factors. Allergies/autoimmune diseases The rate of allergies around the world has risen in industrialized nations over the past 50 years. A number of public health measures, such as sterilized milk, use of antibiotics and improved food production have contributed to a decrease in infections in developed countries. There is a proposed causal relationship, known as the "hygiene hypothesis" that indicates that there are more autoimmune disorders and allergies in developed countries with fewer infections. In developing countries, it is assumed that the rates of allergies are lower than developed countries. That assumption may not be accurate due to limited data on prevalence. Research has found an increase in asthma by 10% in countries such as Peru, Costa Rica, and Brazil. See also Social determinants of health The China Study: 2005 book on the relationship between the consumption of animal products and selected illnesses Affluenza: "placing a high value on money, possessions, appearances (physical and social)