The brain produces a chemical called acetylcholine, essential for memory and other cognitive functions.
A deficiency in acetylcholine is linked to cognitive decline and neurodegenerative diseases like Alzheimer's.

Choline is the precursor to acetylcholine and directly affects acetylcholine synthesis in brain tissue,
and also serves as a precursor to phosphatidylcholine, which is required for membrane synthesis and maintenance of synaptic function.
Meta-analyses show that people with Alzheimer's disease have low choline levels in plasma and cerebrospinal fluid.

Phosphatidylcholine (PC) is an important nutrient found in many foods.
It is a source of choline and essential for brain function.
Studies show that a diet rich in PC may:

Increase acetylcholine levels in the brain
Improve memory and cognitive functions
Reduce the risk of dementia
Protect against other neurodegenerative diseases

Main Study: Analysis of Nearly 2,500 Middle-Aged Adults

A major study on the topic was published in The American Journal of Clinical Nutrition, analyzing data from nearly 2,500 middle-aged adults.
The study found a link between dietary intake of choline and PC and better performance on cognitive tests assessing verbal fluency and memory.

The study presents an in-depth prospective analysis of nearly 2,500 participants with follow-up over 20 years.
The study provides evidence that dietary intake of choline and phosphatidylcholine is associated with better performance on cognitive tests examining verbal fluency and memory.

Study Strengths:

Comprehensive information on dietary intake.
Very long-term follow-up with low dropout (although not all subjects underwent cognitive measurements).

Study Limitations:

Possibility of residual confounding, as occurs in many cohort studies.
It is unclear how effective dietary supplementation would be for people who have already experienced cognitive decline (the study did not include people with dementia at baseline).

Discussion:

Evidence that a single nutrient positively affects cognition or reduces the risk of dementia is limited.
Choline may be unique in that it is the direct precursor to the neurotransmitter acetylcholine, which undergoes critical and progressive decline in Alzheimer's disease.
Stimulating increased production of acetylcholine through intake of a single metabolite (choline) may be more effective than inhibiting acetylcholinesterase (cholinesterase inhibition).
A diet richer in choline may be a potentially useful approach in combination with acetylcholinesterase inhibition.

Choline:

The precursor to acetylcholine.
Directly affects acetylcholine synthesis in brain tissue.
Precursor to phosphatidylcholine, required for membrane synthesis and maintenance of synaptic function.
Low choline levels have been found in people with Alzheimer's disease.
Brain choline concentrations are critically dependent on the circulatory system and are influenced by plasma concentrations.

Key Data:

Higher dietary intake of choline and PC is associated with better performance on cognitive tests.
Men with higher dietary intake of PC had a 28% lower risk of dementia compared to men with low intake.
The study included an exceptionally long follow-up (over two decades) and comprehensive information on dietary intake.

Important to Note:

The study was observational only, so a causal relationship cannot be inferred.
Not all subjects underwent cognitive measurements.

How to Consume More PC in the Diet:

You can increase PC intake in the diet by eating foods rich in PC, such as:

Eggs: Eggs are a primary source of PC, especially the egg yolk. In the study, eggs and meat were the main dietary sources of phosphatidylcholine.
Meat: Red meat and poultry are another primary source of PC.
Fish: Fish contain choline, but fatty fish are not considered a prominent source of phosphatidylcholine.
Nuts and Seeds: Nuts, such as almonds, walnuts, and flaxseeds, contain moderate amounts of choline.
Legumes: Legumes, such as beans and lentils, contain moderate amounts of choline.
Leafy Green Vegetables: Leafy green vegetables, such as spinach, broccoli, and cabbage, contain moderate amounts of choline.

It is important to note that different dietary sources vary in their choline and phosphatidylcholine content.

References:
https://ajcn.nutrition.org/article/S0002-9165%2822%2901320-X/fulltext
https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/learning-behaviour-and-cerebral-protein-kinase-c-antioxidant-status-lipid-composition-in-senescenceaccelerated-mouse-influence-of-a-phosphatidylcholinevitamin-b12-diet/EB998DCB0A8838004C0175915A439F13

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