The term estrogen (same as oestrogen) pertains to a group of chemically similar hormones which are dominant in the female body and responsible for development and maintenance of the female characteristics. Estrogen is present in the male body too, in much lower amounts.
High estrogen levels in men bring about certain negative health conditions and effects on the body. Some of them are “man boobs”, low sex drive, erection difficulties, loss of muscle mass, tiredness, fatigue, accumulation of fat.
Some small amounts of testosterone are always converted into oestrogen in the male body. The main ingredient that carries out this conversion is found in the fat cells. The more body fat a man has, especially around the waist, the more testosterone will be converted. It means more estrogen circulating in his body, and greater tendency to low testosterone and more fat storing.
Women with elevated oestrogen have also higher tendency to storing fat.Read about the other hormones