Obesity is caused by complex interaction of genetic and environmental factors. It is difficult to determine if genetics play a dominant role or environmental factors play the dominant role in causation of obesity. In general a favorable environment and a genetic susceptibility interact to cause obesity.

The actual causes of obesity are still not clear despite tremendous development in medical science, including understanding of molecular pathways which regulate energy balance in humans, an essential component in pathogenesis of obesity. The cause obesity seems to be simple, such as chronic and excess consumption of food (calories) than expenditure of energy. But this theory of chronic excess nutrient intake relative to the level of energy expenditure does not hold in every obese individual, which proves that there are several other causes of obesity than simple consumption of excess food than we need.

Genes vs. Environment in Obesity:

Consumption of alcohol by humans dates back to thousands of years in history. It is difficult to know the exact date when alcohol was invented and its consumption started. In the mythological stories of different countries, there are mentions about alcohol. Alcohol has become part of cultures in many communities. Alcohol is taken to celebrate and alcohol is also taken in sorrow and probably no other substance has this unique distinction.

Mechanism of intoxication of ethyl alcohol:

Different experts on the subject may explain the mechanism of intoxication caused by ethyl alcohol in different ways. I believe the main cause of intoxication after alcohol consumption, is the way alcohol is metabolized in our body. The effect of alcohol in the central nervous system (CNS) is stimulatory as well as depressive.