Dr. Lauren Noel was kind enough to invite me on her podcast show, Dr. Lo Radio, Tuesday evening. You can listen to the show if you'd like here:
At 38:49, Dr. Noel asks me about female patients with triglyceride levels of 20-30 mg/dL. I suggested hypobetalipoproteinemia. Hypobetalipoproteinemia and abetalipoproteinemia are genetic disorders that can lead to very low triglycerides, but if they result in triglycerides below 30 mg/dL, they will generally result in total cholesterol below 100 mg/dL (1). According to the current medical literature (1), blood lipids this low can also result from medical causes such as liver disease and hyperthyroidism, or "lifestyle" causes such as veganism and malnutrition (malnutrition could also be secondary to fat malabsorption). If triglycerides are this low while cholesterol is normal or high, however, I would suspect that a low carbohydrate intake would be the cause. I wouldn't be too concerned about this unless there were signs of other problems such as low thyroid function. Dr. Noel did say that these women often have symptoms of thyroid issues, which could indicate a need to increase carbohydrate intake (or perhaps total calorie intake). If anyone has any better insights about low triglycerides than these, please share them in the comments!
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