Study: NCT00453219

Intervention type: PROCEDURE
Intervention: Screening evaluation
Description: A detailed history will be taken and a physical examination performed along with a blood sample to verify ovulatory status in women with regular cycles and determine cause of anovulation in women with irregular or absent menstrual cycles.

Intervention type: PROCEDURE
Intervention: Screening evaluation
Description: A detailed history will be taken and a physical examination performed along with a blood sample to verify ovulatory status in women with regular cycles and determine cause of anovulation in women with irregular or absent menstrual cycles.

Intervention type: PROCEDURE
Intervention: Screening evaluation
Description: A detailed history will be taken and a physical examination performed along with a blood sample to verify ovulatory status in women with regular cycles and determine cause of anovulation in women with irregular or absent menstrual cycles.

Intervention type: PROCEDURE
Intervention: Meal Response
Description: The investigators are interested in how nutrition and metabolism can influence reproduction and they will look at how the body senses hunger and how it responses to food. Blood samples will be collected and questionnaires given to assess responses and feeling about hunger and food.

Intervention type: PROCEDURE
Intervention: Meal Response
Description: The investigators are interested in how nutrition and metabolism can influence reproduction and they will look at how the body senses hunger and how it responses to food. Blood samples will be collected and questionnaires given to assess responses and feeling about hunger and food.

Intervention type: PROCEDURE
Intervention: Meal Response
Description: The investigators are interested in how nutrition and metabolism can influence reproduction and they will look at how the body senses hunger and how it responses to food. Blood samples will be collected and questionnaires given to assess responses and feeling about hunger and food.

Intervention type: GENETIC
Intervention: Blood Collection
Description: A blood sample will be collected and used to check for genetic markers of stress vulnerability.

Intervention type: GENETIC
Intervention: Blood Collection
Description: A blood sample will be collected and used to check for genetic markers of stress vulnerability.

Intervention type: GENETIC
Intervention: Blood Collection
Description: A blood sample will be collected and used to check for genetic markers of stress vulnerability.

Intervention type: PROCEDURE
Intervention: Functional MRI
Description: research participants will have an functional MRI scan of their brain while reviewing word lists associated with body image and emotions. This procedure will last about 1 hour.

Intervention type: PROCEDURE
Intervention: Functional MRI
Description: research participants will have an functional MRI scan of their brain while reviewing word lists associated with body image and emotions. This procedure will last about 1 hour.

Intervention type: PROCEDURE
Intervention: Functional MRI
Description: research participants will have an functional MRI scan of their brain while reviewing word lists associated with body image and emotions. This procedure will last about 1 hour.

Intervention type: PROCEDURE
Intervention: Endocrine Assessment
Description: research participants will have a 30 hour inpatient hospital admission with every 15 minute blood sampling for 24 hours. Hormone measures of stress, reproduction, and appetite will be obtained.

Intervention type: PROCEDURE
Intervention: Endocrine Assessment
Description: research participants will have a 30 hour inpatient hospital admission with every 15 minute blood sampling for 24 hours. Hormone measures of stress, reproduction, and appetite will be obtained.

Intervention type: PROCEDURE
Intervention: Endocrine Assessment
Description: research participants will have a 30 hour inpatient hospital admission with every 15 minute blood sampling for 24 hours. Hormone measures of stress, reproduction, and appetite will be obtained.