There is a growing interest to the Happiness Index in the world. Purpose of this study is an analysis of the impact of income, UV and latitude on the Happiness Index, incidence and dietary patterns in different countries. Using the Mann-Whitney criterion, it is established that income is 20 times higher in happy countries, and their geographic location is 35 ° to the north of not happy countries (p = 0.001). In the happy countries people live 27 years longer, more rarely suffer from cardiovascular diseases, diabetes and asthma (p = 0.001), more often suffer from oncological diseases, Alzheimer›s disease and alcoholism (p = 0.001). The diet in happy countries contains more animal products and alcoholic beverages (p = 0.001). The Happiness Index, life expectancy, frequency of cardiovascular diseases, Alzheimer's disease, breast and prostate cancer, and dietary patterns depend on the Income (p = 0.001). The frequency of alcoholism, diabetes, asthma, lung and stomach cancer depend on latitude and UV (p = 0.001). The Happiness Index and dietary patterns do not depend on latitude and UV. Income, latitude and UV have irrespective effects on the country performance. The results can be used for disease prevention.