Gold Member Badge


  • You're all caught up!

I Am Underweight & Want to Get Pregnant

author image Jordan Saibil
Jordan Saibil began writing professionally in 2010. He pursued a medical degree at Columbia University's College of Physicians and Surgeons as well as a law degree at the Cardozo School of Law. He holds a Bachelor of Science with honors in psychology from McGill University and a health sciences degree from Marianopolis College.
I Am Underweight & Want to Get Pregnant
Young thin woman looking upset with a pregnancy test. Photo Credit: JackF/iStock/Getty Images

Although it happens every day and appears to be a simple process, several conditions must be met for a woman to successfully conceive. One of these is that she should be neither overweight nor underweight -- either condition may have a negative effect on conception. Achieving a proper weight can help a woman who is having trouble conceiving.

Video of the Day

Defining Underweight

Anyone with a low body mass index may have trouble getting pregnant according to the Advanced Fertility Center of Chicago. If your BMI is below 18.5, you are considered underweight at a level that may be problematic for conception. For example, a woman who is 5 feet 4 inches and weighs 105 lbs. has a BMI of 18 and may not be able to conceive. Even if you're only slightly underweight, it can impair your ability to get pregnant.

How It Affects Ovulation

You typically need at least 17 percent total body fat to ovulate regularly. Ovulation involves the release of an egg from your ovaries, which continues into your uterus to get fertilized by a sperm. says that if there is too little body fat, it could disrupt the hormone flow from the brain to the pituitary glands that encourages the ovaries to release an egg. In this case, you will not ovulate or get your period.

How It Affects Fertility

Women who do not ovulate cannot get pregnant. Akashia Anderson of the Vanderbilt University Psychology Department says that women who have even 10 to 15 percent too little body fat may have either irregular menstrual cycles or a complete cessation of menstruation. Without ovulation, pregnancy cannot occur under any circumstances. Some women who are underweight can go for many years without having a period. Some women may have infertile bleeding, so getting a monthly period is not necessarily an indication that you are fertile.

What to Do

Fortunately, most women who gain the necessary weight to reach an ideal BMI will be able to correct their infertility and go on to get pregnant if all other conditions are in place. This may involve reducing your workout routine if you exercise to maintain low body fat or increasing the amount of fat that you consume in your diet. After weight gain, most women start to ovulate regularly, and if they don't, there are procedures to help them if they maintain their new weight.

LiveStrong Calorie Tracker
Lose Weight. Feel Great! Change your life with MyPlate by LIVESTRONG.COM
  • Gain 2 pounds per week
  • Gain 1.5 pounds per week
  • Gain 1 pound per week
  • Gain 0.5 pound per week
  • Maintain my current weight
  • Lose 0.5 pound per week
  • Lose 1 pound per week
  • Lose 1.5 pounds per week
  • Lose 2 pounds per week
  • Female
  • Male
ft. in.


Demand Media