What is a Butyrylcholinesterase (BCHE) Deficiency?

Butyrylcholinesterase is a mouthful, so we’ll call it BCHE or Buche, from the gene it’s coded by. This is one of our cholinesterase enzymes, needed to detoxify.

Most of you know about digestive enzymes, but our bodies also produce other types of enzymes that help our bodies function correctly. These enzymes are coded by our DNA. If our DNA has a genetic variant or mutation, it may not produce the needed enzymes, and this can be considered a genetic disorder.

My personal journey with BCHE began when I underwent a DNA test as part of family planning before embarking on the path of IVF due to infertility concerns. The test was to determine if we had any genetic disorders we could pass down to our children. I was contacted by the geneticist and informed that I have one of the gene variants for Pseudocholinesterase Deficiency on the BCHE gene. She told me it was nothing to worry about, and it may only affect me if I have surgery with certain types of anesthesia. She said, just let the anesthesiologist know, and they know what to do.

Pseudocholinesterase is another name for Butyrylcholinesterase, but it was named that way because they thought BChE had no significant role in the body. I have a lot of health problems. If this BCHE deficiency is the only genetic disorder I have, then is it possible, there is more going on with this deficiency? Just to be sure I wasn’t missing anything, I Googled it, and it led me to several websites that talk about anesthesia problems.

In a nutshell, there are several types of anesthesia that can be used in surgery. The BCHE deficiency causes a sensitivity to certain muscle relaxants – choline esters: succinylcholine and mivacurium. This particular issue with BCHE deficiency is well studied because people were going brain dead. Those of us with the BCHE variant were unable to wake after surgery. It turns out we need breathing assistance until we can clear the drug from our body.

This is not the ONLY issue this BCHE deficiency causes, but it was the only one I saw at the time. I didn’t realize until years later when I rediscovered the BCHE gene in my raw DNA data, that it indeed can cause more problems. It was referred to A-Typical BuChE. This led me to SNPedia and Anne Wright’s work.

According to SNPedia & Anne Wright, this genetic variant creates a sensitivity to not only choline esters, but also cholinesterase inhibitors or CIs. Anne Wright, an MIT engineer, explains this well in her blog. This is a must read if you want to wrap your head around this.

The other issues are not well studied and the full function of BCHE hasn’t been known. What we do know is BCHE is a scavenger or detoxing enzyme. It protects the brain from pesticides, herbicides, and nightshade alkaloids. It protects Acetylcholinesterase enzymes, or ACHE enzymes, after the gene they are coded by. ACHE enzymes breakdown and balance the neurotransmitter Acetylcholine. If our BCHE is too low, it can’t protect ACHE, and it can’t breakdown and balance Acetylcholine. Then Acetylcholine goes too high and builds up. The other neurotransmitters like dopamine, go too low. This is not a good thing. Some of the issues this can cause muscle spasms (pain), anxiety, insomnia, pain, migraines, digestive problems, and fatigue, just to name a few.

You can also develop an Acquired Butyrylcholinesterase Deficiency. This means, you do not need to have the genetic variant to have the BCHE deficiency. You can acquire the BCHE deficiency from the following:

  • Exposure to chemical pesticides & herbicides
  • Exposure to Sarin gas (Gulf War Syndrome)
  • During hormonal changes like with pregnancy or on birth control. Menopause isn’t studied with BCHE deficiency, but many of our group members became sensitive to nightshades during menopause.
  • Liver or kidney disease
  • Chronic infections
  • Certain cancers
  • Protein malnutrition
  • Severe burns
  • Cocaine addiction
  • Certain prescription drugs
  • Solanine / Nightshades – from eating too many nightshades, especially with high alkaloid content like potatoes with green on them.


Plants in the nightshade family include tomatoes, peppers, potatoes, eggplant, goji berry, and tomatillo. Also the spices, starches, and food additives made from them. I’ve written a more complete list here.

Nightshades have a toxic glycoalkaloid, but well just call them alkaloids. They are a natural pesticide in the plant. Our bodies require the same enzymes to detox them as chemical pesticides and herbicides. They are all called cholinesterase inhibitors (CIs). In other words, the enzymes needed to detoxify the alkaloids and chemical pesticides/herbicides, are lowered, the more you are exposed.

In individuals with reduced BCHE activity due to genetic variants, the inhibition of BCHE by alkaloids may result in the accumulation of these substances in the body. For me this can cause pain, brain fog, anxiety, headaches, and it disrupts my sleep. Some of these symptoms may be occurring due to lymphatic backflow into the brain with these toxins.

The level of alkaloids in nightshades can vary greatly. This makes it hard to narrow down nightshades as the trigger for your symptoms. It’s known that potatoes with green on them have high level of alkaloids and they have killed people. Not everyone will die from eating potatoes with green, those of us with the BChE deficiency are likely the ones to die from them. They have not studied how nightshades with lower levels of alkaloids can affect us with this deficiency. Those of us who’ve identified the genetic variant and are reacting to nightshades, know that eating any nightshades can be a problem for us. For many of us with this genetic BCHE deficiency, we did not develop the extreme sensitivity to nightshades, until one of these other factors in the Acquired BCHE Deficiency occurred. For me personally, pregnancy is what elevated my sensitivity to nightshades. I know I was reacting to them before pregnancy, it just wasn’t as intense. Plus, it didn’t help that I developed and allergy in addition to the sensitivity, after my pregnancy.

High Oxalate Foods

I believe our gut health and oxalates could also be an issue with BCHE. If our gut health is impaired, we may not have enough Oxalobacter formigenes to break down oxalates in gut. Oxalates then put stress on our liver and kidneys and impair the glutathione needed for detoxification. Taking antibiotics can destroy oxalobacter formigenes and it cannot be replenished with probiotics. If this is what has happened to your gut, avoiding oxalates in your diet, may be beneficial. Many nightshades happen to also be high in oxalates and may be why some of us have more severe reactions. Sally Norton, has done extensive work researching oxalates and she’s explained them well in her book, Toxic Superfoods.

Toxic Superfoods, by Sally Norton - Click to order on Amazon.

More Recent Studies on BChE

Recent studies with mice have shown BChE is also responsible for processing fats and proteins. It’s also involved in fat accumulation and the hunger hormone ghrelin. Mice with low BChE can live completely normal, healthy, fertile lives until drugs or toxins are introduced. BChE knockout mice (mice with no BCHE) became obese on the same diet as normal mice. They found that BCHE breaks down ghrelin, the hunger hormone. When they inject ghrelin into mice, the mice with high ghrelin become obese eating the same amount of food as the other rats. See, “calories in, calories out” is BS.

Low BChE is also associated with alcohol and drug addictions, specifically cocaine.

Recent studies have also shown people with low BChE are at higher risk of death from certain cancers, covid, sepsis, major adverse cardiac events, severe trauma, and coronary heart disease.

The latest study on SIDS has shown that babies who died of SIDS had low BChE at birth. The study did not say if these babies had the genetic variant or if the mother had the genetic variant or if the mother had low BChE enzymes.

How do you know if you have a BChE Deficiency?

Most people don’t know about this deficiency, and most will never find out unless they happen to have surgery and are given choline esters. Lets just hope you don’t wake up in the morgue, like one of my group members. Anesthesiologists are supposed to know what to do when they encounter this, but apparently, some aren’t aware. If that’s the case, I want to know if I have this deficiency, prior to surgery.

In my next BChE article, I will share way you can find if you have this deficiency.

Originally, I wanted to repair my BCHE deficiency and eat nightshades again. But I’ve decided that my body is obviously trying to tell me not to eat them. I’m okay with that now and I’ve found a diet that works better than any of the other dozens of diets I’ve been on over the years. I am happy, satiated, and most of my chronic auto-immune like symptoms are all gone.

That’s BCHE in a nutshell. Hopefully more studies will be done. For now, we can be thankful for knockout mice. Stay tuned to learn more! Don’t forget to follow me on Facebook to receive my latest posts in your feed.

NEXT: How to Search Raw DNA Data Files for BCHE Variants

NEXT: Advancements in Treating Obesity, Anxiety, Depression, BCHE Deficiency, Pesticide and Herbicide Poisoning – The Healing Blossom


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  1. Jennifer Siskind says:

    Nice explanation. Just adding in another nightshade source: ashwagandha sometimes found in health supplements.

    1. Jen, you are right – I intended to link to my more detailed article about nightshades. I will add the link. Thanks for pointing it out.

  2. Candice Milliard says:

    Are there other ways to get your raw DNA? A professional?

    1. I’ve had DNA testing order by doctors, but they do not release the raw data. You could ask for your doctor to order DNA testing on the BCHE gene if you are curious about it, but insurance may not pay for it. My doctor recently ordered testing for EDS genes and my insurance denied it. Now I’m stuck with a $2000 bill.

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