What part of the body does obesity most effect?

Heart, liver and....: Complications of obesity effect about every major organ system. Significant increase risk of heart disease, the major cause of fatty liver which can lead to steatohepatitis and cirrhosis major risk factor for type 2 diabetes, sleep apnea, gout, reproductive organs, decrease in fertility. High cholesterol & triglycerides. Fat, especially the viceral or deep abdominal fat causes inflammation of body.

Multiple: Obesity has multiple effects. It can be a factor in diabetes, Arterial disease, arthritis and depression. These are linked to inflammatory chemicals from the adipose tissue itself.