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Help! Missed Period After Fasting!

by Mike S.


If anyone who is experienced in this can help it would be greatly appreciated. We're kind of freaking out.

My girlfriend recently has decided to start fasting one day a week. She started this about 6 weeks ago, the last week of November or so (though she skipped Christmas Day.)

On fasting days she typically only drinks about 4 glasses of water with apple cider vinegar and honey, and several other glasses of water, very low calorie except for the honey--- maybe 200-300 calories a day.

In the last 5 weeks with the fasting she has lost about 10 pounds which is about 8% of her body weight. She is of athletic build.

Her BMI is now about 20. She says she has never lost this much weight this quickly. She eats a varied omnivore diet otherwise-- she's not a vegan, but doesn't drink milk.

Anyway, her period was due around December 31. She typically averages about a 30-33 day cycle, it varies, but is regular.

She has only ever missed one month in her life about 12 years ago when she was traveling, and it's never been longer than 33 days. Anyway, it is now day 37 with no period and we are concerned about two things: pregnancy and her health.

What we want to know is, is it possible that she has missed her period because of the fasting and rapid weight loss? We haven't tested for pregnancy yet. It seems unlikely that she is pregnant, though there is a non-zero possibility. Also, she is concerned that the fasting may have injured her in some way.

She hasn't done any long term fasts, just a one day fast four weeks in a row with weight loss of about 8% of her body weight.

Any advice would be appreciated!!!


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Oct 31, 2013
Fasting..yes! NEW
by: Anonymous

Ya it is most definitely the fasting..tho im not all tht sure becuz u said she only fasted one day a week..same thing happened to me..for religious reasons..i had to fast a whole month..eating early in the morning and then in the evening..unknowingly i ate way too many less calories..n well even after the fasting month was ovr n i resumed regular eating period didnt cum back fr abt 2 1/2 months..n to mention i lost only five i got worried n gained abt 7 pounds in like literally 4 days..ya it was painful:)
but period came back jst i was disappointed i gained more then hw much i was originally..but now im losing weight again..n well period still is ya fasting was the problem..nt the best choice fr women..seriously!

Jul 15, 2011
Not alone
by: Anonymous

I did a water fast for four days, and am now 29 days late. I'm definitely not pregnant, and have read several comments on people's disrupted periods due to fasting.

Feb 26, 2011
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Feb 04, 2011
by: Anonymous

I did a 21 day water fast a year and a half ago and have not gotten my period since. This happens to many women who fast and i believe it is healthy. Most women once they resume to their regular eating habits will start bleeding again soon after they reintroduce food. I have not because my diet it a low fat raw vegan diet.

Jan 12, 2011
by: Mike S

Hi, I'm the OP of this thread.

My GF period finally came, about 8 days late. This is latest she has ever been. The only difference as mentioned is that she fasted 4 one-day fasts in the previous 5 weeks.

After doing some research, I learned that when they did studies on rats fasting, the fasting rats' estrogen levels went up because estrogen was stored in fat and the rats started burning fat.

So, just and FYI for others, when you fast and go into ketosis, estrogen levels might spike and throw off your period.

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