Alcohol has dramatic negative impact on the weight loss, as not only it reduces the number of fat calories you burn but also increases your appetite and can reduce your testosterone levels for up to 24 hours after you finished your last drink.
The impact of the alcohol on the human body is very much different than from any other food group. When you have a normal meal your body gets its energy from the calories from the carbohydrates, proteins and fat, which are slowly digested within your stomach. However, when you drink alcohol it does not get digested but instead, diffuse through the stomach very quickly, reaching liver and brain within minutes.
This effectively means than rather than processing calories from normal food, your body gets its energy from alcohol calories, which offer absolutely no nutritional value to your body. Consequently, since your body gets powered by alcohol calories, nutritional calories such as carbohydrates and dietary fats do not get burned and your body does not get all the benefits out of them instead they get stored as permanent fat deposits.