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Ask Nurse Lynn: PWS BMI Ranges

Question:

Female, 30 years old, UPD subtype

Should a person with PWS use the same BMI ranges as someone without PWS? We are trying to figure out a good goal weight range for my loved one. Currently, her BMI is around 20 – which her PCP says is normal. Is this a good measurement to use in determining the healthiest weight for her, or should her BMI be lower than “typical” ranges due to hypotonia?

Nurse Lynn’s Response:

Your loved one’s BMI of 20 falls within the acceptable range — which is great for someone with PWS. It suggests she’s maintaining a good balance for long-term health, energy, and mobility.  Since BMI doesn’t tell the full story in PWS, some doctors and dietitians may also look at:

  • Waist circumference(goal: < 35 inches for women)
  • Body composition(DXA scan or bioelectrical impedance)
  • Energy level, muscle tone, and endurance
  • Metabolic labs(lipids, glucose, insulin resistance)

The BMI guidelines for adult women with PWS are as follows:

<19.1= underweight

19.2-27.3= acceptable

>27.3 = overweight

>32.3 = Severely Overweight

> 44.8= Morbidly Obese

Resources:

https://www.pwsausa.org/wp-content/uploads/2022/12/Nutrition-Adolescence-Adult-Revised-Aug-2022.pdf

The above link will help inform about goal weight setting and calories per day along with other great nutritional information for adults with PWS.

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