Depression is higher is females than males for several reasons. Girls tend to hit puberty
before boys do. Puberty causes girls’ hormones to rage and, when mixed with the pressures of
school, parents and figuring out sexual identity, depression rates rise.
Depression rates can also
rise during pregnancy. Being pregnant causes hormones to rise as well as restricting women with
what they can do. During pregnancy women cannot drink alcohol, take medication, certain foods
are off limits and caffeine must also be limited. Women can also accidentally get pregnant, have
miscarriages, or lose the ability to become pregnant altogether. Collectively, the stress and
weight put on women during pregnancy or while trying to become pregnant results in higher
depression rates than found among men.
Depression affects certain parts of the brain, which alters the whole. There are three parts
of the brain which are affected by depression: the hippocampus, the prefrontal cortex, and the
amygdala. The hippocampus is found near the center of the brain. It stores memories and
regulates the production of a hormone called cortisol. The body releases cortisol during times of
physical and mental stress, including during times of depression. Problems can occur when
excessive amounts of cortisol are sent to the brain due to a stressful event or a chemical
imbalance in the body. In a healthy brain, brain cells (neurons) are produced throughout a
person’s adult life in a part of the hippocampus called the dentate gyrus. In people with MDD,
however, the long-term exposure to increased cortisol levels can slow the production of new
neurons and cause the neurons in the hippocampus to shrink
.
The prefrontal cortex is the second part of the brain affected by depression. The
prefrontal cortex is in the very front of the brain. It handles regulating emotions, making
decisions, and forming memories. When the body produces an excess amount of cortisol, the
prefrontal cortex also appears to shrink.
The prefrontal cortex handles self-control and