Admittedly separating genetics from behavior is difficult, but scientists consider genetic fact

Obesity is a complex issue and a serious illness rather than simply a weight condition. Obesity has been regarded as a personal moral failing, a behavioral issue that's easily fixed by people who have sufficient willpower to do so. The modern scientific understanding of obesity is that it is a complex disease in its own right. (Stein par 1). The causes of obesity are various and often interlinked. We can summarize that mitochondria has the key role for genetic factors, serotonin has the key role for psychological factors and technological change has the key role for environmental factors. But all three factors altogether make a person obese, and any attempt to solve the obesity problem should include all the factors: genetic, psychological or environmental factors, not just individually but all the factors as a whole.

Besides genetic and environmental factors, psychological factors also play an important role to cause obesity. Many people eat in response to negative emotions such as boredom, sadness, anger, anxiety or other emotional disorders. But how does eating more relieve depression? Overweight people eat carbohydrate-rich foods that help to reduce depression or eliminate it altogether. Because of tremendous technological change, carbohydrates are easily available and very cheap. Overweight people eat carbohydrates not only because they are available in abundance, but also because people develop carbohydrate craving. Carbohydrate craving is actually a form of self-medication that temporarily relieves depression because carbohydrates increase levels of a key neurotransmitter in the brain, called serotonin, which makes you feel “up,” positive and happy. Basically carbohydrates produce a chemical reaction in the brain: when one eats carbohydrate, the production of insulin is stimulated, which allows an amino acid called tryptophan to enter the brain; tryptophan stimulates the production of serotonin and as a consequent serotonin makes us feel good (Hill 15). This change in mood is so subtle that we are not consciously aware of it. Apparently, chronically overweight people have become subconsciously addicted to the serotonin-stimulated, happy, comfortable feeling. This subconscious addiction makes people obese.

ors as the primary reason for obesity. That is why pharmaceutical

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