Weight Loss After Pregnancy Hormones
Mainly, it is the overactive thyroid; a condition known as hyperthyroidism, that causes excessive weight loss in women after pregnancy.. Unintentional hormones and losing weight after pregnancy may result from loss of body fats, loss of body fluids, muscle atrophy, or a combination of these.   it is generally regarded as a medical problem when at least 10% of a person's body weight has been lost in six months   or 5% in the last month. . Approximately 5-7% of women experience thyroid problems after pregnancy. also known as postpartum thyroiditis, this condition causes unstable levels of hormone production. an under-active thyroid leads to weight gain and may require treatment after pregnancy if the problem persists..