I am also 27 and not had a period for 3 years, mine stopped after I lost weight and started to exercise a lot. After posting this someone found this article and sent it on...... 'Yes, losing weight can affect your menstrual cycle. This happens for several reasons. One, as stated below, is due to a lack of body fat, particularly brown adipose tissue around the midsection. The body will try not to allow pregnancy if you do not have the physical resources to protect that pregnancy. Also, any large weight adjustment causes a shift in hormones, because estrogen release is partially based on your fat cells. When you lose a large amount of weight, estrogen automatically declines. If you stop losing this weight at a healthy weight, once your body adjusts to the new amount of hormones, you should return to normal. Another reason for lack of menstruation after weight loss is poor nutrition, related to a lack of iron, zinc and lack of healthy dietary fats. Regardless of how much you exercise, or how much you weigh - if you have a lack of iron, zinc and healthy fat in your diet, you can develop amenorrhea' .............It has given me something to go at as I to am reluctant to take the prescribed pill so going to try adding Iron etc into my diet.
i have only had my period twice in one year. scares the crap outta me! but the doctors said not to worry but i think 3 years w/out one could be somthing serious.