Cell membranes and fats: Why half the nutrition debate misses the point
- Dr. Reiner Kraft
- 1 day ago
- 20 min read
Why I did this work
Eat more butter . No, eat olive oil . Saturated fat is the enemy. Saturated fat was never the problem, it was the carbohydrates . Take omega-3 . Take omega-3, 6, 7, and 9 in balance. Don't eat eggs because of the cholesterol . Eat eggs, the cholesterol in food doesn't matter.
I've followed this for many years, both professionally and personally. And at some point, it dawned on me: I had a collection of recommendations, but no model. I could say what should be done. I couldn't say why, and certainly not which of the recommendations conflicted with each other and which only contradicted each other because they spoke of different levels.
From my time in the tech industry, I know this situation well. You have a lot of rules that sort of work, but nobody has ever clearly documented the underlying architecture. And as long as that remains the case, you can't decide which rule prevails in a conflict.
So I sat down and reconstructed it from the bottom up. Not starting with the recommendations, but with the question:
What is a cell membrane actually made of, where does this material come from, and what parts of it can actually become scarce?
The result surprised me in several ways. In two instances, I had to discard my own working hypothesis. That's precisely why I'm writing it down.
The starting point: a huge construction site
Your body replaces around 330 billion cells every day , about 80 grams of cell mass . Most of these are blood cells and intestinal lining .[1]
Each of these cells needs a membrane . And this membrane is not a passive packaging. It plays a role in determining how well insulin binds, how well mitochondria function, and how well nerve cells transmit signals.
My first thought was obvious: if cell membranes consist of more than half phosphatidylcholine , and if billions of new cells are created every day, then you need a lot of it. So the amount you consume must matter.
This reasoning is wrong. But it's wrong in a useful way, because if you pursue it, you'll arrive at something better.
Part 1: What a cell membrane consists of
Imagine a double row of matchsticks, head to head, heads facing outwards.
Each matchstick is a phospholipid . The most common one is called phosphatidylcholine , or PC for short .
A PC molecule has four parts:
Part | function | Origin |
Choline (the head) | water-loving end | largely from food |
Glycerin and phosphate | the scaffold | The body can build its own structures without limit |
Two fatty acids (the tails) | determine mobility | partly self-built, partly essential |
The two tails are not the same.
This is a detail that explains a lot. The two fatty acids are located in two different positions, and these positions are occupied differently:
Position sn-1 almost always carries a saturated fatty acid, usually palmitic acid or stearic acid. This is the stable anchor.
Position sn-2 usually carries an unsaturated fatty acid: oleic acid, linoleic acid, arachidonic acid, or DHA. This is the mobile, functional part.
The body actively exchanges the fatty acid at position sn-2, depending on need and supply.[14] Therefore, it is sn-2 that determines membrane quality, and therefore it is where Omega 3 can have an effect.
So when someone says you need a balance of saturated and unsaturated fats, that's actually very accurate at the molecular level. The body regulates this balance itself, and reliably at that. More on that in a moment.
And then there's cholesterol.
There's a common misconception here. Cholesterol doesn't simply make the membrane harder. It works in both directions:
In a membrane that is too soft, it aligns the chains and makes them stronger.
In a membrane that is too rigid, it prevents dense packing and makes it more flexible.
The result is a state that no single fatty acid can create: ordered and stable, yet still liquid. This is the basis of so-called lipid rafts , small, ordered islands on which receptors and signaling proteins are located. A large part of cell communication takes place there.
This difference in thickness is precisely the sorting mechanism. A receptor protein with a long transmembrane segment only fits into the thicker region and accumulates there. Proteins with a short transmembrane segment are excluded. In this way, signaling platforms are formed without the cell having to actively sort them, solely through lipid physics.
Two honest limitations: Rafts are very small, in the range of 10 to 200 nanometers, and short-lived. This schematic representation with clear borders is a simplification. And the existence and functional significance of rafts in living cells was long controversial because early evidence relied on detergent extraction, which itself produces artifacts. Today, the concept is considered established, but it's not as hard a fact as the PC biochemistry in the rest of your article.
Key point: Fatty acids set the operating point. Cholesterol keeps it stable.
Part 2: The three construction roads
The body has three ways to produce PC. Separating these three resolves most of the contradictions.
Street A: The standard route
It runs in every cell of your body.
The cell absorbs free choline from the blood and uses it to build its own computer. This is the mass metabolism for growth, division, and repair.
The entry point is choline, not PC. At the very top, there's no phosphatidylcholine, but rather the bare head group. This is visual proof of why PC capsules don't count as a building block. They are broken down in the intestine and end up right here again as choline.
The lateral entry point is the quality factor. Diacylglycerol carries the two fatty acids. Everything the body currently has available in terms of fatty acids enters this pathway. Therefore, your fatty acid supply determines what kind of PC (polycythemia vera) you ultimately get, not just how much.
The crucial point: The cell doesn't accept ready-made PC . PC from your food is broken down in the intestine and reassembled in the intestinal epithelium. Not a single PC molecule from your breakfast egg arrives unchanged in a muscle cell.
This is precisely where my first mistake lay. I had thought of PC as a brick. It isn't. It's a choline transport medium.
Street B: The emergency route
It only occurs in the liver , is called PEMT and covers about one third of the liver's PC production.[10]
The body can produce choline itself by attaching three methyl groups to a related molecule. This serves as a safety net if too little choline is consumed.
This street has three peculiarities, and all three are important:
First: It's costly. Every self-produced choline molecule consumes three methyl groups. These are then no longer available for gene regulation, homocysteine breakdown, or creatine synthesis. Choline is therefore not solely a membrane issue, but also a methylation issue.
Secondly, it is hormonally regulated, not demand-driven. That was my second mistake. I had assumed the body activates this pathway when choline is lacking. It doesn't. It is activated by estrogen . PEMT transcription increases in a dose-dependent manner when human liver cells are treated with estradiol, and a perfect estrogen response element is located in the gene approximately 7.5 kilobases upstream of the starting point.[4]
Specifically, this means:
Premenopausal women can drive up the street.
Women lose this reserve after menopause .
Men never really have it. It runs on a low setting and can't be turned up.
Additionally, there is a common gene variant ( rs12325817 ) in which the risk allele binds neither the estrogen receptor nor the helper factor FOXA1. Hormonal control is then simply switched off.[5]
The comparison to Street A is the real insight here, and it lies in four differences:
The switch comes from outside. In route A, there isn't one. In route B, the entire process depends on a hormone that has nothing to do with choline requirements. That's why men and women can't compensate after menopause.
The starting material is free, the process is not. PE is abundant, but each molecule of PC costs three methyl groups. Route A, on the other hand, only requires choline, which comes from food.
Homocysteine is an output, not an input. Therefore, it is not a PEMT marker. A weak pathway B produces less homocysteine, not more. Anyone interpreting this value as a deficiency sign is interpreting it completely incorrectly.
The exit points out of the cell. Pathway A builds for the cell's own needs, path B produces for export. This is why PEMT deficiency primarily affects the liver, brain, and eyes, and not the cell membranes in general.
The human data are clear. In a controlled depletion study, 77 percent of men and 80 percent of postmenopausal women on a low-choline diet developed fatty liver disease or muscle damage. In premenopausal women, the figure was only 44 percent .[3]
Thirdly: It delivers a special quality. This formula preferentially produces PC with DHA , the long-chain omega-3 fatty acid. And it is precisely this DHA-containing PC that is the transport vehicle for the brain and eyes.
The brain cannot produce DHA itself and must import it from the blood. The responsible transporter at the blood-brain barrier is called MFSD2A and takes up DHA exclusively in the form of lysophosphatidylcholine , not as a free fatty acid.[9] The same applies to the eye: Mice lacking this transporter have DHA-poor eyes, shortened photoreceptor outer segments, and disrupted membrane discs.[13]
Without the choline head group, DHA cannot be transported. This is where choline and omega-3 fatty acids need each other.
Street C: The reconstruction
This is the least known and most explained street.
Road A provides only the basic structure . Enzymes then cleave the fatty acid at position sn-2 and insert a different one. Only then is the complete membrane formed. This process is called the Lands cycle .
And it is selective . There are different enzymes for different fatty acids, regulated in a tissue-specific way.[14] The cell chooses. It doesn't indiscriminately incorporate whatever happens to be there.
But it can only incorporate what's available in the bloodstream. That's precisely why membrane quality depends on the fatty acid supply in your diet, and that's precisely why the Omega-3 index is measurably changeable.
The whole mechanism in one sentence: Pathway A builds the basic structure from choline, path C supplies it with fatty acids, path B is the hormonally regulated emergency reserve. What you can control is the raw material for A and the supply for C.
Part 3: What could really become scarce
And this is where it gets practical. Of the four membrane components, only two can be controlled through diet:
component | Controllable? | Why |
Choline | YES | Endogenous production is limited and hormone-dependent. |
Omega 3 and Omega 6 | YES | true essential fatty acids |
Saturated and monounsaturated fatty acids | no | The body can build unlimited structures from any surplus. |
cholesterol | no | The body builds it up itself according to its needs. |
For me, this is the most important finding from the entire research.
Saturated fat is not a scarce building block for membranes. Palmitic acid is produced from acetyl-CoA, which the enzyme SCD1 then converts into oleic acid. Humans do not suffer from a deficiency of this. Omega-7 and omega-9 fatty acids belong to the same category: beneficial, but not essential.
Only two fatty acids are essential : linoleic acid (Omega 6) and alpha-linolenic acid (Omega 3).
This reduces the entire complicated fat balance discussion to a single controllable quantity: the ratio of Omega 3 to Omega 6.
What happens if you eat too much or too little butter?
On the membrane side: almost nothing. The body buffers this, among other things via SCD1 and the selectivity of the Lands cycle.
What changes is elsewhere. Too little butter deprives you of beneficial nutrients like vitamin K2 and retinol, not building blocks. Too much butter raises LDL cholesterol, provides many calories, and—this is the real membrane effect— displaces olive oil, nuts, and fish from your plate.
Not what's in it, but what's missing.
Part 4: How severe is the choline shortage really?
The numbers
The European reference value (EFSA) is 400 mg per day for adults, 480 mg during pregnancy, and 520 mg while breastfeeding.[7] In the USA, the values are 550 mg for men and 425 mg for women.
What food provides:
Groceries | Choline |
1 large egg | approx. 147 mg |
100g beef liver | approx. 350 mg |
1 tbsp sunflower lecithin (10 g) | approx. 340 mg |
100g salmon | approx. 90 mg |
100g chicken breast | approx. 85 mg |
100 g soybeans | approx. 120 mg |
100g broccoli | approx. 40 mg |
The egg is by far the most practical source. The choline is almost entirely contained in the yolk.[11]
Two limitations that must be honestly stated.
I could write that half the population is suffering from deprivation. That would be a powerful statement. It just wouldn't be accurate.
First: The EFSA value was not derived from a measured requirement, but approximated from the observed average intake in Europe. In the EU surveys, the mean values were 269 to 444 mg per day for women and 332 to 468 mg for men.[7] If you set a reference value on the mean, half the actual intake will automatically be lower. That's statistics, not a finding.
Secondly, and this is the more important point: EFSA has explicitly stated that none of the available biomarkers for choline intake or choline status were suitable for deriving reference values.[7]
There is currently no validated laboratory test for choline deficiency. Anyone selling you one is operating outside the realm of available data. This also applies to indirect methods.
Where it becomes real
Not on average, but in specific situations:
Women after menopause. The emergency reserve disappears.
Pregnant women. In the only German survey to date, the median intake was 260 mg per day, and only 7 percent reached the reference value. Vegetarian and vegan pregnant women had significantly lower intakes, at 205 mg compared to 270 mg.[8]
Vegans and vegetarians. The best sources are animal-based.
People with insufficient folate and vitamin B12 levels. More on that in a moment.
Carriers of the PEMT variant , but only if the supply is simultaneously scarce.
The most important point about the genotype: A PEMT result doesn't tell you if you have a deficiency. It tells you how much choline you need to eat to ensure you don't have a deficiency. With adequate intake, it's practically meaningless. It's a modifier of requirements, not a diagnosis.
Part 5: The Methylation Context
Everything comes together here.
The emergency pathway consumes methyl groups. These come from a shared source, supplied by folate, vitamin B12, and choline itself . Multiple contributors, multiple withdrawals.
Controlled studies showed that as long as folate levels were adequate, blood choline levels remained stable even with low choline intake. Only when both became scarce simultaneously did choline and PC levels drop and homocysteine levels rise.[7]
Practical consequence: Choline is rarely the problem in isolation. It becomes a problem in combination with low folate and vitamin B12 levels.
A warning I only recently realized: Homocysteine is a good marker for overall methylation throughput, but not a marker for PEMT function. The reason is a trap. Pathway B produces homocysteine as a byproduct. Therefore, weak pathway B can even be associated with lower homocysteine levels. The value can point in either direction.
Part 6: What this has to do with cholesterol, and what it doesn't.
I had a hypothesis myself that sounded intuitively good but turned out to be wrong. I'm writing it down because I encounter it frequently.
The hypothesis
If someone has high cholesterol levels, it means that the cholesterol isn't getting into the cells properly and is staying outside. If the cell membranes were better structured, the cholesterol levels would be more balanced.
Sounds plausible. Mechanistically, it's the other way around.
How it actually goes
Cells are never low in cholesterol. They have a built-in sensor in the membrane of the endoplasmic reticulum, the membrane system inside the cell where lipids are produced.
The mechanism is well understood: When cholesterol levels rise in the ER membrane, it binds to the sensor protein SCAP, which then attaches to Insig, and the complex remains trapped in the ER. The target genes are then no longer transcribed. When cholesterol levels fall below a certain threshold, the complex migrates to the Golgi apparatus, the transcription factor SREBP-2 is released, and it activates the genes for cholesterol synthesis and the LDL receptor in the cell nucleus.[12]
Consider my scenario: If cells were actually undersupplied, they would build more LDL receptors, remove more LDL from the blood, and the lab value would be low , not high.
High LDL cholesterol is not a picture of a starving cell. It is a picture of a system that has had enough and has reduced its intake.
Where high LDL really comes from
Genetics. In the familial type, the LDL receptor itself is defective. Here, too, the cells don't starve; they simply produce their own cholesterol. The problem is the LDL that remains in the bloodstream.
Saturated fatty acids downregulate the LDL receptor in the liver. Approximately 70 percent of LDL removal occurs via the liver.
Insulin resistance. The liver produces too much VLDL. Three things work together: the adipose tissue releases fatty acids uncontrollably, high insulin levels drive fat production in the liver, and the fatty liver packages more fat into VLDL.
Lipoproteins, briefly explained
It's a chain, not a list:
From where | freight | Direction | |
VLDL | liver | high triglyceride | Liver to tissue |
LDL | is derived from VLDL | high cholesterol | Liver to tissue |
HDL | Liver and intestines | cholesterol | Tissue back to the liver |
VLDL releases its triglycerides along the way, becoming LDL in the process . High VLDL levels today mean high LDL levels tomorrow.
The connection that actually exists
There is a real connection between membranes and blood lipids, just a different one than previously thought:
First: A membrane low in DHA activates the SREBP signaling pathways and thus promotes fat synthesis. Adequate omega-3 intake dampens this process.
Secondly, without sufficient PC, the liver cannot package and export fat as VLDL. It remains in the liver. This is precisely how fatty liver develops in cases of choline deficiency. In animal models, the combined absence of PEMT and choline led to a decrease in the PC-to-PE ratio, resulting in loss of membrane integrity and liver failure. The same ratio pattern is found in patients with fatty liver hepatitis.[6]
The stable formulation: Membrane lipids are not cholesterol regulators. They are regulators of lipid synthesis .
Part 7: What you can do specifically
Stage 1: Nutrition
Choline cover
Eggs are the most practical way. Two eggs already cover over 70 percent of the reference value.
Liver every one to two weeks covers a lot at once.
Fish, poultry, and soybeans as a base.
Sunflower lecithin granules are an affordable supplement. One tablespoon is roughly equivalent to two egg yolks. It can be stirred into yogurt, smoothies, or dressings.
Targeted intake of Omega 3
Fatty sea fish two to three times a week: salmon, herring, mackerel, sardines.
Alternatively, algae oil. For people who don't eat fish, it's the only direct source of DHA.
Flaxseed oil is not a substitute. The conversion of plant-based omega-3 to DHA in humans is in the low single-digit percentage range.
Do not increase Omega 6 additionally.
Virtually everyone consumes the essential amount anyway. Large quantities of sunflower, safflower, and corn oil negatively skew the ratio. Olive oil and rapeseed oil are the less problematic everyday oils.
Folate and B12 are ensured
Green leafy vegetables and legumes are good sources of folate. Vitamin B12 supplementation is necessary for a purely plant-based diet.
Stage 2: What makes sense to measure
marker | What he shows | Meaningfulness |
Omega-3 Index (erythrocytes) | actual installation in membranes | high , best available membrane marker |
Holo-transcobalamin, folate | B12 and folate status | high |
Lipid profile including ApoB | Transport system | Good for the cardiovascular system |
Homocysteine | Total methylation throughput | medium, see warning above |
Liver function tests, liver ultrasound | possible consequence of a PC bottleneck | medium, nonspecific |
PEMT genotype | Demand modifier | only in conjunction with intake history |
"Choline level" | nothing validated | not resilient |
The Omega-3 Index is the only marker on this list that truly tells you what's in your membranes, and it's specifically adjustable. If you only want to measure one thing, make it this.
Stage 3: Supplements
Sensible:
Algae or fish oil if the Omega-3 index is low and fish is rarely eaten.
Sunflower lecithin is recommended when choline intake is noticeably low, especially in plant-based diets, after menopause, and during pregnancy.
Vitamin B12 for plant-based diets, folate in case of proven deficiency or during pregnancy.
Not very useful:
PC capsules. Choline makes up only about 13 percent of PC's weight. The usual doses are too low to have any noticeable effect. Lecithin in spoonable form is significantly cheaper and provides more.
Liposomal preparations as a membrane source. The liposomes do not survive digestion; their phospholipids are broken down like any other lecithin. A typical product containing 1000 mg of phospholipids from sunflower lecithin provides roughly 50 to 70 mg of choline, which is less than half an egg. Such a product can be useful for the actual active ingredient inside. However, as a choline source, it is uneconomical.
High doses of choline bitartrate significantly increase TMAO levels in the blood more than choline from food. Whether and to what extent TMAO is actually harmful is not yet fully understood scientifically. However, there is no reason to create unnecessarily high levels when food can achieve the same result.
What you don't need to control at all: saturated fatty acids, Omega 7, Omega 9, cholesterol. The body produces all four of these itself, according to its needs.
Summary in seven sentences
The body never has too little membrane material. It sometimes has material of the wrong quality.
Only two building blocks can truly be controlled through diet: choline and essential fatty acids , especially Omega 3.
Preformed phosphatidylcholine from food is broken down. It is considered a choline source, not a building block.
The liver has an emergency reserve for producing its own choline, but this is hormonally regulated. Men and postmenopausal women have hardly any of this reserve.
This emergency reserve costs methyl groups. That's why choline, folate, and vitamin B12 are related.
High LDL cholesterol does not mean that cholesterol cannot enter the cells. The relationship works the other way around.
The most practically effective and best measurable lever is the Omega-3 Index .
FAQ
If cell membranes consist of more than half PC and billions of cells are produced daily, don't I need a lot of PC?
You need a lot of PC (phosphatidylcholine), but you don't have to eat it. The body produces it on an assembly line. Just for digestion, the liver releases more PC into the bile daily than you absorb through food, and it continuously regenerates it. What you need is the raw material for the "head" group , namely choline, and the essential fatty acids for the "tail" groups. The body has everything else.
Why can't I just take a PC in capsule form?
Because PC doesn't arrive as a molecule. It's broken down in the intestinal lumen, reassembled in the intestinal epithelium, packaged into lipoproteins, and metabolized in the liver. For your muscle cells, it's then choline plus fatty acids, no longer PC. The crucial question, therefore, is always: How much choline does the product provide? In the case of PC, that's around 13 percent of its weight.
I'm measuring tissue using a bioenergetic method and the phosphorus level is low. Does this mean there's too little protease (PC) in the membranes, and that there's actually a choline deficiency?
The conclusion at the end of this chain happens to be correct, but the path leading there is flawed. Three points:
First , membrane phospholipids are only a small part of the body's phosphorus. Around 85 percent is found in bone, with a large portion of the remainder in ATP, DNA and RNA, and phosphorylated proteins. Even if you could precisely measure tissue phosphorus, the proportion attributable to membrane PCs would be small, and changes in them would be difficult to attribute to specific cells.
Secondly , phosphorus is practically never a limiting factor in our diet. It is found in meat, dairy products, legumes, nuts, and many food additives. Dietary phosphate deficiency is rare in healthy individuals. If serum phosphate is truly low, it should be medically investigated, as the issue then relates to the kidneys, parathyroid glands, vitamin D, or medications, not to membrane building blocks.
Thirdly , the chain has too many untested links: measurement methods for tissue phosphorus, tissue phosphorus for membrane PC, membrane PC for choline supply. Bioenergetic scanning methods are not validated against accredited laboratory chemistry. Even if each individual link were 80 percent accurate, the overall chain would only be around 50 percent accurate. It's a gamble.
The practical answer: If you want to know the state of your membranes, measure your Omega-3 Index . If you want to know your phosphate levels, have your serum phosphate measured by an accredited laboratory. And if you want to assess your choline status, the most honest way to do this currently is through your choline intake history , because there is no validated marker.
The core of your intuition is correct: Phosphorus is never the bottleneck. Choline can be.
Are the two fatty acid tails Omega 3 and Omega 6?
Not quite. The tail at position sn-1 is almost always saturated , typically palmitic or stearic acid. Only position sn-2 carries an unsaturated fatty acid, and anything can be found there: oleic acid (omega-9), linoleic acid (omega-6), arachidonic acid (omega-6), or DHA and EPA (omega-3). So it's not an omega-3 and an omega-6 tail. It's a stable anchor and a variable functional site, and only the latter is influenced by diet.
I have a PEMT variant in my genotype report. What do I do now?
First clarify your intake, then interpret the genotype. This variant doesn't increase your risk; it increases your needs , and even then, only if your intake is limited. With two eggs a day or a tablespoon of lecithin, it's practically irrelevant. A genotype without a dietary context is not a basis for action.
Is saturated fat good or bad for cell membranes?
Neither. It's neutral because it's never in short supply. The body produces palmitic acid and oleic acid from any calorie surplus. Saturated fat only becomes relevant to cell membranes when it displaces the essential fatty acids from our plates. The effect on LDL cholesterol is a separate issue and belongs in the cardiovascular discussion, not the cell membrane discussion.
Why is the Omega-3 Index better than a blood test for Omega 3?
Because it measures in the red blood cells , i.e., in the actual membrane, and thus reflects a period of about three months. A plasma value, on the other hand, essentially tells you what you've eaten in the last few days. The index measures incorporation, while the plasma measures intake.
Is linseed oil sufficient instead of fish?
Yes, for Omega 3 in the sense of alpha-linolenic acid. No, for DHA. The body's own conversion rate is in the low single-digit percentage range, and even lower in men than in women. If you're concerned about your brain, eyes, and membrane health, you need DHA directly, so from fish or algae oil.
Can choline and omega-3 fatty acids slow down aging?
There is no evidence for this. What is proven concerns the prevention of deficiencies , not any further optimization. There is good basic research showing that prostate-concentrating capacity decreases with age and that prostate-concentrating levels in the blood are associated with better physical and cognitive function.[2] However, association is not causation, and an aging model in nematodes does not automatically translate into a recommendation for humans. I consider the topic promising and incomplete, and I prefer to write it that way rather than exaggerate its importance.
What I learned from this research
Two of my initial assumptions proved incorrect. The idea that proton pump sulfate (PC) is a brick that needs to be ingested. And the idea that the body automatically compensates for a choline deficiency.
What remains is simpler than what I started with, and at the same time more precise. Two adjustable parameters instead of four. One marker that actually says something, instead of a list of values. And a clear criterion for when a genotype becomes relevant and when it doesn't.
For me, that's the real benefit: not more recommendations, but fewer, yet justifiable ones.
Limits and note
Much of this is based on well-documented basic research and controlled nutritional studies in humans. Where animal models are used as the basis, this is stated in the text. Where the data is limited, I have indicated this.
It has not been proven that targeted choline or phospholipid supplementation extends lifespan in people who are already well supplied.
This article is for informational purposes only and does not replace medical advice. Any abnormal blood lipid levels, liver function tests, or existing medical conditions should be evaluated by a physician.
References
[1] Sender R, Milo R. The distribution of cellular turnover in the human body. Nature Medicine . 2021;27(1):45-48. https://doi.org/10.1038/s41591-020-01182-9
[2] Ermolaeva M et al. Loss of phosphatidylcholine biosynthesis drives mitochondrial decline in aging. Nature Communications . 2026. https://www.nature.com/articles/s41467-026-71508-7
[3] Fischer LM, daCosta KA, Kwock L, Stewart PW, Lu TS, Stabler SP, Allen RH, Zeisel SH. Sex and menopausal status influence human dietary requirements for the nutrient choline. American Journal of Clinical Nutrition . 2007;85(5):1275-1285. https://doi.org/10.1093/ajcn/85.5.1275
[4] Resseguie M, Song J, Niculescu MD, da Costa KA, Randall TA, Zeisel SH. Phosphatidylethanolamine N-methyltransferase (PEMT) gene expression is induced by estrogen in human and mouse primary hepatocytes. FASEB Journal . 2007;21(10):2622-2632. https://doi.org/10.1096/fj.07-8227com
[5] Resseguie ME, da Costa KA, Galanko JA, Patel M, Davis IJ, Zeisel SH. Aberrant estrogen regulation of PEMT results in choline deficiency-associated liver dysfunction. Journal of Biological Chemistry . 2011;286(2):1649-1658. https://doi.org/10.1074/jbc.M110.106922
[6] Li Z, Agellon LB, Allen TM, Umeda M, Jewell L, Mason A, Vance DE. The ratio of phosphatidylcholine to phosphatidylethanolamine influences membrane integrity and steatohepatitis. Cell Metabolism . 2006;3(5):321-331. https://doi.org/10.1016/j.cmet.2006.03.007
[7] EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). Dietary Reference Values for choline. EFSA Journal . 2016;14(8):4484. https://doi.org/10.2903/j.efsa.2016.4484
[8] Roeren M, Kordowski A, Sina C, Smollich M. Inadequate Choline Intake in Pregnant Women in Germany. Nutrients . 2022;14(22):4862. https://doi.org/10.3390/nu14224862
[9] Nguyen LN, Ma D, Shui G, Wong P, Cazenave-Gassiot A, Zhang X, Wenk MR, Goh ELK, Silver DL. Mfsd2a is a transporter for the essential omega-3 fatty acid docosahexaenoic acid. Nature . 2014;509:503-506. https://doi.org/10.1038/nature13241
[10] Jacobs RL, Vance DE. Finding the balance: the role of S-adenosylmethionine and phosphatidylcholine metabolism in development of nonalcoholic fatty liver disease. Hepatology . 2013. https://doi.org/10.1002/hep.26499
[11] Zeisel SH, Mar MH, Howe JC, Holden JM. Concentrations of choline-containing compounds and betaine in common foods. Journal of Nutrition . 2003;133(5):1302-1307. https://doi.org/10.1093/jn/133.5.1302
[12] Yan R, Cao P, Song W, Qian H, Du X, Coates HW, Zhao Y, Li Y, Wang S, Brown AJ, Yan N. A structure of human Scap bound to Insig-2 suggests how their interaction is regulated by sterols. Science . 2021;371(6533). https://doi.org/10.1126/science.abb2224
[13] Wong BH, Chan JP, Cazenave-Gassiot A, Poh RW, Foo JC, Galam DLA, Ghosh S, Nguyen LN, Barathi VA, Yeo SW, Luu CD, Wenk MR, Silver DL. Mfsd2a is a transporter for the essential omega-3 fatty acid docosahexaenoic acid (DHA) in eye and is important for photoreceptor cell development. Journal of Biological Chemistry . 2016;291(20):10501-10514. https://doi.org/10.1074/jbc.M116.721340
[14] Xu Y, Miller PC, Phoon CKL, Ren M, Nargis T, Rajan S, Hussain MM, Schlame M. LPGAT1 controls the stearate/palmitate ratio of phosphatidylethanolamine and phosphatidylcholine in sn-1 specific remodeling. Journal of Biological Chemistry . 2022;298(3):101685. https://doi.org/10.1016/j.jbc.2022.101685
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