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Choline

Overview

Choline is an essential nutrient. The liver does not synthesise enough to meet requirements, so intake depends on food and, when diet falls short, supplements [1]. Eggs, meat and milk dominate surveyed intakes; some plants such as broccoli contribute smaller amounts [1]. This page treats dietary choline as a food constituent — not as a proxy for lecithin trials, phosphatidylcholine–DHA transport studies, or cholinergic-receptor work.

Derbyshire (2019) places choline in neurotransmitter synthesis, membrane phospholipids, methylation via glycine betaine, liver function and homocysteine regulation. IOM and EFSA have set adequate intakes; most surveyed European, US, Canadian and Australian populations fall below them, and UK databases still omit choline [1]. Derbyshire and Maes (2023) report low or altered choline status in pregnancy and in some people with autism spectrum conditions, ADHD or dyslexia — a possible modifiable risk factor, not a treatment trial [2]. EFSA authorised lipid, liver and homocysteine claims in 2011; neurological-function evidence was not judged sufficient then [1].

Key Compound Highlights

Essential: endogenous synthesis does not meet human requirements [1].
Oxidised choline (glycine betaine) contributes to S-adenosylmethionine for DNA and histone methylation [1].
Eggs, meat and milk are the main dietary providers; further restriction of those foods can lower intake [1].
Most surveyed European, American, Canadian and Australian populations miss adequate-intake thresholds; UK composition databases and guidelines still omit choline [1].
Neurodevelopmental narrative: low or altered status reported in pregnancy and in some people with ASC, ADHD or dyslexia — not an ADHD treatment trial [2].
EFSA 2011 authorised claims for lipid metabolism, liver function and homocysteine reduction; neurological-function evidence was not judged sufficient [1].

Dietary Context

Food sources

Animal foods contain more choline per unit weight than plant sources. Beef, eggs, fish, chicken, nuts, milk and some plants such as broccoli contribute; eggs, dairy and meat dominate in the intake surveys summarised by Derbyshire [1]. Egg consumers in US NHANES data had almost twice the usual choline intake of non-consumers [1].

Synergies

One-carbon metabolism is shared with folate and related B vitamins; UK survey practice still reports those B vitamins and not choline [1]. Oestrogen status and PEMT genotype can raise choline requirements above the general adequate intake [1]. Phosphatidylcholine–DHA transport across the blood–brain barrier is a separate phosphatidylcholine story and is not attributed here.

Supplement versus food

US survey analyses found that meeting the adequate intake was difficult without eggs or a supplement [1]. If food does not supply enough, Derbyshire flags supplementation especially in pregnancy and lactation [1]. Lecithin is a concentrated phosphatidylcholine source, not equivalent to the egg or meat matrix. Food-page choline listings are compositional.

Recipes

Foods

References

[1] BMJ Nutrition, Prevention & Health: choline is essential (hepatic synthesis does not meet requirements); glycine betaine contributes to S-adenosylmethionine; IOM and EFSA adequate intakes exist; UK databases, surveys and guidelines still omit choline; most surveyed European, US, Canadian and Australian populations fall below AI; eggs, milk and meat are major sources. Derbyshire 2019. Could we be overlooking a potential choline crisis in the United Kingdom?

[2] Narrative review: low choline intakes and reduced or altered choline status reported in pregnancy and in some people with autism spectrum conditions, ADHD or dyslexia; choline may be a modifiable risk factor; not a randomised treatment trial. Derbyshire and Maes 2023. The Role of Choline in Neurodevelopmental Disorders—A Narrative Review Focusing on ASC, ADHD and Dyslexia

BRS matrix — individual KC inputs

BRS / PM	Relationship	Biological role and limitation
BRS1 · BRS1-FM1-PM3 BRS2(KC1)	Supported upstream supply	Choline can be oxidised to betaine for BRS2 PM2 — BHMT remethylation, predominantly in liver and kidney, replenishing methionine upstream of BRS2 PM3 — SAM synthesis. SAM is used by COMT during dopamine metabolism. Limitation: Only choline-to-betaine methyl supply is admitted, not membrane or acetylcholine roles. Oxidation, peripheral BHMT, alternative methionine supply and local neural SAM turnover limit interpretation. Neural delivery, increased clearance, a limiting constraint and extra-intake benefit are not measured. Obeid (2013) [25] Salvi and Gadda (2013) [28] Bailey et al. (2021) [26] Lotta et al. (1995) [29]
BRS1 · BRS1-FM1-PM4 BRS2(KC1)	Supported upstream supply	Choline can be oxidised to betaine for BRS2 PM2 — BHMT remethylation, predominantly in liver and kidney, replenishing methionine upstream of BRS2 PM3 — SAM synthesis. SAM is used by COMT during noradrenaline metabolism. Limitation: Only choline-to-betaine methyl supply is admitted, not membrane or acetylcholine roles. Oxidation, peripheral BHMT, alternative methionine supply and local neural SAM turnover limit interpretation. Neural delivery, increased clearance, a limiting constraint and extra-intake benefit are not measured. Obeid (2013) [20] Salvi and Gadda (2013) [23] Bailey et al. (2021) [21] Lotta et al. (1995) [24]
BRS1 · BRS1-FM3-PM7 BRS2(KC1)	Supported upstream supply	Choline can contribute methyl groups through the upstream methionine/SAM route to BRS2 PM7 — PEMT-dependent phosphatidylcholine formation. Methyl-derived LPC-DHA is a carrier used by MFSD2A for brain DHA delivery. Limitation: Human plasma isotopic enrichment is not absolute hepatic flux, net carrier supply or adult neuronal DHA incorporation. Higher choline intake did not increase total plasma LPC-DHA in the feeding study. The carrier-to-brain connection uses separate cell/mouse transport evidence. Donor inadequacy as a limiting constraint, compensation and benefit from extra intake remain unresolved. Klatt et al. (2019) [11] Nguyen et al. (2014) [12]
BRS2 · BRS2-FM1-PM2 BRS2(KC1)	Conditional constraint	Dietary precursor that can be oxidised to betaine, the methyl-donor substrate for BHMT Limitation: Choline oxidation can supply betaine, but increasing choline intake has not been shown to increase tissue BHMT flux. Human evidence is an eight-man depletion pilot, with the challenge response in four clinically depleted participants; tissue BHMT flux was not measured. Rat donor rescue and specific inhibition support the chain. This does not establish ordinary-diet limitation, response in every tissue or benefit above adequacy. Folate’s indirect constraint on BHMT remains unresolved. Obeid (2013) [3] Salvi and Gadda (2013) [4] Evans et al. (2002) [1]
BRS2 · BRS2-FM1-PM3 BRS2(KC1)	Supported upstream supply	Choline can be oxidised to betaine, supplying methyl groups through PM2 — Betaine/BHMT remethylation for methionine regeneration upstream of PM3. Limitation: Only the choline-to-betaine methyl-supply route is admitted here, not choline membrane or neurotransmitter roles. Oxidation, predominantly hepatic/renal BHMT activity and alternative supply constrain interpretation. Increased MAT flux, increased SAMe availability or benefit from additional choline in replete individuals is not established. Obeid (2013) [8] Salvi and Gadda (2013) [10]
BRS2 · BRS2-FM1-PM4 BRS2(KC1)	Supported upstream supply	Choline can be oxidised to betaine, supplying methyl groups through PM2 — Betaine/BHMT remethylation for methionine regeneration within the integrated methionine cycle. Limitation: Only the choline-to-betaine methyl-supply route is admitted here, not choline membrane or neurotransmitter roles. Oxidation, predominantly hepatic/renal BHMT activity and alternative supply constrain interpretation. Increased integrated cycle flux or improved branch balance or benefit from additional choline in replete individuals is not established. Obeid (2013) [17] Salvi and Gadda (2013) [19]

Choline

Overview

Key Compound Highlights