Choline: Why the Liver and Brain Urgently Need This Nutrient
Laura Chrobok 30.10.2026
A nutrient whose deficiency can lead to fatty liver within just a few weeks. One that is also important for communication between our nerve cells and whose role in brain development is attracting increasing scientific interest. We are talking about choline, a substance that is unfortunately nowhere near as well known as most vitamins — yet is essential for life.
What makes choline so special? And how much of it do we actually need? Its many functions and the scientific findings surrounding them are well worth a closer look.
Choline: What Is It?
Choline is an essential nutrient. Although our bodies can produce certain choline-containing compounds themselves, this production is insufficient to meet our total requirements. We therefore also depend on obtaining choline from our diet.
In the past, the substance was sometimes referred to as “vitamin B4”, but it is no longer classified as a vitamin in its own right.
Choline owes its versatility primarily to the fact that it serves as a precursor for various compounds.
Particularly important are:
o Phosphatidylcholine: A key component of our cell membranes that is also needed to transport fats out of the liver.
o Acetylcholine: A neurotransmitter involved in learning and memory processes, among other things, as well as the transmission of signals between nerves and muscles.
o Betaine: A breakdown product of choline that provides methyl groups needed, for example, for homocysteine metabolism.
Choline is therefore involved in several fundamental processes that, at first glance, seem to have little to do with one another (EFSA NDA Panel, 2016).
Choline During Pregnancy: How This Nutrient Can Influence Fetal Development
Long before a child enters the world, its brain develops at an astonishing pace. Billions of nerve cells form, migrate to their designated locations and establish connections with one another. To build this complex network, the body needs numerous nutrients. Choline is one of them.
The nutrient is needed, for example, to produce phosphatidylcholine, an important component of cell membranes. It also serves as a precursor for acetylcholine, a neurotransmitter that plays a role even during the development of the nervous system.
Scientists investigated how differences in maternal choline intake might affect subsequent development in a controlled feeding study involving 26 pregnant women. During the final trimester of pregnancy, the women received either a total of 480 mg or 930 mg of choline daily.
After birth, the researchers observed how quickly the children responded to visual stimuli. A remarkable difference emerged: children whose mothers had received the higher amount of choline processed visual information significantly faster on average. This advantage was evident at several assessment points throughout the first year of life.
(Caudill et al., 2018)
But could differences in choline intake still have an effect years later? A follow-up study involving 20 children from the same study group provided interesting evidence.
At the age of seven, they completed a twelve-minute attention test in which they had to recognise signals displayed for varying lengths of time.
Children from the group whose mothers had received more choline were better able to maintain their attention. This was particularly evident with the shortest signals, which were visible for just 17 milliseconds: while the detection rate in the 480 mg group fell by 22.9% over the course of the test, it remained stable or increased slightly by 1.5% in the 930 mg group.
(Bahnfleth et al., 2022)
Even more recent findings come from a randomised study published by the University of Colorado in October 2026: 206 pregnant women were randomly assigned to either a supplement or placebo group. From the 16th week of pregnancy, they received either 9,000 mg of phosphatidylcholine or a placebo daily. The stated amount refers to the entire phosphatidylcholine compound — not 9,000 mg of pure choline.
The researchers subsequently investigated the children’s cognitive development, among other things. Intelligence test results were available for 103 children. The average IQ test score was 7.78 points higher in the phosphatidylcholine group than in the placebo group. The difference was statistically significant.
Furthermore, pronounced social withdrawal problems occurred less frequently in the phosphatidylcholine group. However, there was no statistically significant difference in the attention problems that were also assessed.
(Hunter et al., 2026)
These three studies provide interesting evidence that choline during pregnancy may be important for subsequent brain development. However, they do not yet justify a general recommendation for the high amounts of choline used in the studies.
Choline and the Brain: Memory and Cognitive Performance
Brain development is largely complete at some point. Its work, however, continues throughout our lives. Studies involving adults also suggest that choline intake may be associated with our cognitive abilities.
In the American Framingham Offspring Study, involving 1,391 participants aged between 36 and 83, people who consumed more choline through their diet achieved better results on tests of verbal and visual memory on average.
In addition, higher choline intake during an earlier assessment period was associated with fewer so-called white matter hyperintensities. These are changes in the brain’s white matter that can be associated with vascular damage and cognitive impairment, among other things (Poly et al., 2011).
We explain the role that vascular changes can play in dementia in our article “Dementia: Types, Symptoms, Risk Factors — and Differences Between Men and Women” and in the “Codex Humanus”.
The Norwegian Hordaland Health Study, involving 2,195 people aged between 70 and 74, also produced interesting findings. Participants with higher concentrations of free choline in their blood performed better on several cognitive tests, particularly those assessing processing speed and general cognitive performance (Nurk et al., 2013).
Both studies therefore demonstrate an association between choline and certain cognitive abilities — but research into the liver provides particularly striking evidence of just how important the availability of this substance can be.
Choline: Deficiency and Fatty Liver
Our liver processes large quantities of nutrients every day. In doing so, it must not only store and convert fats, but also release them to other tissues. This is where phosphatidylcholine comes into play again.
The liver needs this compound to produce and release so-called VLDL particles (very-low-density lipoproteins). These transport fats from the liver to other tissues in the body. If too little phosphatidylcholine is available, this transport process can be disrupted, causing more fat to remain in the liver cells.
Scientists investigated how quickly this can have an effect in a controlled feeding study involving 57 healthy women and men. After an initial period of adequate intake, participants followed a diet severely restricted in choline for up to 42 days. During this time, their liver fat content and various blood parameters were monitored.
The findings were striking:
· 77% of the men developed fatty liver or signs of muscle damage.
· 80% of postmenopausal women showed corresponding organ changes.
· 44% of premenopausal women were affected.
However, these changes proved reversible: once the affected participants received sufficient choline again, the observed abnormalities subsided (Fischer et al., 2007).
This demonstrated directly in humans how important choline is for normal liver function. However, the study involved a deliberately induced, severe deficiency. It therefore does not describe the consequences of every slightly inadequate intake.
The fundamental importance of this nutrient is so well established that several health claims have been authorised in the European Union:
o Choline contributes to normal lipid metabolism.
o Choline contributes to the maintenance of normal liver function.
(European Commission, 2012)
Adequate choline intake therefore supports important requirements for normal liver function. However, this does not automatically mean that additional choline supplements can treat an existing fatty liver.
Choline and Homocysteine: A Demonstrated Effect on Metabolism
Alongside the liver and brain, choline also plays a role in the metabolism of the amino acid homocysteine.
Some of the choline we consume is converted into betaine in the body. Betaine provides methyl groups needed to convert homocysteine back into methionine.
Scientists investigated whether this process could be influenced by additional choline intake in a controlled study involving 26 men with mildly elevated homocysteine levels. In a randomised crossover design, participants received either phosphatidylcholine providing approximately 2.6 g of choline or a placebo for 14 days each.
During phosphatidylcholine supplementation, the average fasting homocysteine concentration fell by 18% compared with placebo.
The increase in homocysteine following an experimental methionine load was also smaller. After 14 days, this increase was reduced by an average of 29% compared with placebo.
(Olthof et al., 2005)
The study therefore documents a substantial metabolic effect. However, the amount of choline used was far higher than normal daily intake. Furthermore, lowering homocysteine levels does not automatically mean that cardiovascular disease can be prevented.
Nevertheless, the fundamental physiological function is established:
Choline contributes to normal homocysteine metabolism.
(European Commission, 2012)
Choline in Foods: Good Dietary Sources
Choline is found in both animal and plant-based foods.
The following overview shows examples of choline content:
Food………………………………………..…….……......……................Choline per serving
Beef liver, fried, approx. 85 g………………………….………………………….…….356 mg
Beef, braised, approx. 85 g……………………………………………….……………...117 mg
Soybeans, roasted, ½ cup…………………………………………………..………...….107 mg
Chicken breast, roasted, approx. 85 g…………………………………….………...….72 mg
Cod, cooked, approx. 85 g………………………………………………………….....….71 mg
Large baked potato with skin…………………..……………………………… …...….57 mg
Quinoa, cooked, 1 cup……………………………………………………… ……………43 mg
Broccoli, cooked, ½ cup……………………………………………………………….....31 mg
A single large hen’s egg provides approximately 147 mg of choline. Anyone wishing to learn more about the health significance of this food can find further information in our article“Eggs: Sources of Nutrients or Cholesterol Bombs — How Healthy Are They Really?”
Actual choline amounts may vary depending on portion size, origin and preparation of food.
(NIH Office of Dietary Supplements, 2022)
Daily Choline Requirements: How Much We Need
The European Food Safety Authority (EFSA) has established the following reference values for adequate daily choline intake:
o Adults: 400 mg
o Pregnant women: 480 mg
o Breastfeeding women: 520 mg
(EFSA NDA Panel, 2016)
These are so-called Adequate Intakes, meaning estimated amounts considered sufficient for adequate nutritional intake. They are not precisely defined minimum requirements. As always, a balanced diet is essential.
Choline is available as a dietary supplement in various forms, including choline bitartrate, phosphatidylcholine, citicoline and alpha-GPC. Lecithin can also serve as a source because it contains phosphatidylcholine.
However, these compounds differ in their chemical composition and actual choline content. Anyone comparing supplements should pay attention to the amount of choline they actually contain (Kansakar et al., 2023).
Choline Dosage: Possible Risks and Side Effects
Taking particularly high amounts of choline is not necessarily beneficial.
For example, it can cause:
· Nausea
· Excessive sweating
· A drop in blood pressure
· A fish-like body odour
Individual requirements may be influenced by hormonal factors, genetic characteristics and the intake of other nutrients.
(EFSA NDA Panel, 2016; NIH Office of Dietary Supplements, 2022)
Conclusion: Choline Is Versatile and Essential for Life
Whether transporting fats out of the liver, transmitting signals between nerve cells or supporting homocysteine metabolism, choline performs functions that are indispensable for a properly functioning body.
Choline is therefore anything but an insignificant component of our diet. Behind this little-known name lies an essential nutrient that should no longer be overlooked!
FAQ — More Frequently Asked Questions About Choline
1. Can a deficiency be detected through a blood test?
Choline concentrations in the blood can, in principle, be measured. However, a single blood measurement is not a reliable indicator of long-term choline status. This is partly because the body can influence blood concentrations through its own metabolic processes, for example by releasing choline from phospholipids.
A normal choline level therefore does not automatically prove that intake is adequate. There is currently no generally established diagnostic method for identifying a dietary choline deficiency (EFSA NDA Panel, 2016).
2. Why can hormones and genes influence choline requirements?
Some of the body’s phosphatidylcholine is produced with the help of the enzyme phosphatidylethanolamine N-methyltransferase (PEMT).
Oestrogens can stimulate this metabolic pathway. This could explain why premenopausal women in some studies were less sensitive to a low-choline diet than men or postmenopausal women. In addition, genetic variants can influence the activity of various enzymes involved in choline and folate metabolism (Fischer et al., 2007; NIH Office of Dietary Supplements, 2022).
3. Should additional choline be taken during pregnancy?
Although choline requirements increase during pregnancy, the first priority is to obtain sufficient amounts through the diet.
Whether supplementation beyond this is advisable should be discussed individually with a doctor, particularly for women whose diets exclude eggs, meat or fish (NIH Office of Dietary Supplements, 2025).
Further information on choline — and, of course, many other topics — can be found not only on our blog, but also in our “Medizinskandale” book series and the “Codex Humanus,” the fifth volume of which was recently published. We look forward to welcoming you to our online shop.
Sources:
· EFSA Panel on Dietetic Products, Nutrition and Allergies (2016): “Dietary Reference Values for choline,” EFSA Journal.
· Caudill, M. A. et al. (2018): “Maternal choline supplementation during the third trimester of pregnancy improves infant information processing speed: a randomized, double-blind, controlled feeding study,” The FASEB Journal.
· Bahnfleth, C. L. et al. (2022): “Prenatal choline supplementation improves child sustained attention: A 7-year follow-up of a randomized controlled feeding trial,” The FASEB Journal.
· Hunter, S. K. et al. (2026): “Prenatal Maternal Phosphatidylcholine and Children's Behavior and Cognition through 4 Years of Age: Randomized Clinical Trial,” American Journal of Obstetrics and Gynecology.
· Poly, C. et al. (2011): “The relation of dietary choline to cognitive performance and white-matter hyperintensity in the Framingham Offspring Cohort,” The American Journal of Clinical Nutrition.
· Nurk, E. et al. (2013): “Plasma free choline, betaine and cognitive performance: the Hordaland Health Study,” British Journal of Nutrition.
· Fischer, L. M. et al. (2007): “Sex and menopausal status influence human dietary requirements for the nutrient choline,” The American Journal of Clinical Nutrition.
· Europäische Kommission (2012): “Verordnung (EU) Nr. 432/2012 der Kommission vom 16. Mai 2012 zur Festlegung einer Liste zulässiger anderer gesundheitsbezogener Angaben über Lebensmittel als Angaben über die Reduzierung eines Krankheitsrisikos sowie die Entwicklung und die Gesundheit von Kindern,” Amtsblatt der Europäischen Union.
· Olthof, M. R. et al. (2005): “Choline supplemented as phosphatidylcholine decreases fasting and postmethionine-loading plasma homocysteine concentrations in healthy men,” The American Journal of Clinical Nutrition.
· NIH Office of Dietary Supplements (2022): “Choline – Fact Sheet for Health Professionals,” National Institutes of Health.
· Kansakar, U. et al. (2023): “Choline supplements: An update,” Frontiers in Endocrinology.
· NIH Office of Dietary Supplements (2025): “Dietary Supplements and Life Stages: Pregnancy – Fact Sheet for Health Professionals,” National Institutes of Health.
Header images are AI-generated illustrative images.