Choline gets depleted through a combination of inadequate dietary intake, increased bodily demand, and specific lifestyle factors that burn through your reserves faster than you can replace them. The vast majority of people in the United States already consume less than the recommended adequate intake of 425 mg/day for women and 550 mg/day for men, so even modest additional drains on choline stores can tip the balance toward deficiency.
Low Dietary Intake Is the Starting Point
The most straightforward cause of choline depletion is simply not eating enough of it. Eggs are the single most concentrated common food source, and one analysis of national dietary data concluded that meeting the adequate intake from food alone is “extremely difficult” if eggs are not consumed. This puts vegetarians and vegans at particular risk of running low. Because choline is concentrated in animal-derived foods like eggs, liver, and fish, plant-based diets require careful planning to avoid a shortfall.
Folate status also matters. Choline and folate share overlapping roles in a process called one-carbon metabolism, where they help the body build DNA and process amino acids. When folate intake is low, the body compensates by pulling more from its choline reserves, specifically converting choline into a backup molecule called betaine. A diet low in both folate and choline creates a compounding deficit where the body can’t keep up through its own internal production.
Pregnancy and Breastfeeding Drain Maternal Stores
Pregnancy is one of the most demanding life stages for choline metabolism. The fetus develops in what researchers describe as a “choline-rich environment,” with choline concentrations in amniotic fluid roughly ten times greater than in the mother’s blood. The placenta itself holds about 50 times more choline than maternal blood, and newborn blood levels run six to seven times higher than adult levels. All of that choline comes from the mother.
This steep maternal-to-child gradient actively depletes the mother’s reserves, which is why the recommended intake rises to 450 mg/day during pregnancy and 550 mg/day during breastfeeding. The drain is significant enough that it increases the mother’s risk of developing fatty liver disease. Despite these higher needs, most pregnant individuals fall short of even the standard recommendation.
Endurance Exercise Burns Through Choline Fast
Prolonged physical activity causes sharp, measurable drops in circulating choline. Runners in the Boston Marathon showed a 40 percent decline in plasma choline levels by the finish line. In controlled studies, triathletes experienced an average 17 percent drop during exercise, while two hours of running reduced plasma choline by as much as 55 percent. Cyclists show similar patterns.
The body uses choline during exercise to produce a signaling molecule essential for muscle contraction. The longer and harder the effort, the more choline gets consumed. For recreational exercisers, this temporary dip likely recovers with a normal meal. For endurance athletes training daily, repeated depletion without adequate dietary replacement can chip away at overall choline status over time.
Alcohol Disrupts Choline Metabolism
Chronic alcohol consumption alters choline metabolism across multiple tissues, not just the liver. Alcohol metabolism shifts the liver into a hypermetabolic state that disrupts normal choline processing. At the same time, alcohol damages the gut lining, and choline plays a protective role in maintaining intestinal barrier function. When alcohol impairs the gut, the body needs more choline to repair it, while simultaneously making less choline available through normal metabolic pathways.
This is one reason chronic heavy drinking is so strongly linked to fatty liver disease. The liver depends on choline to package and export fat. When alcohol depletes choline reserves and disrupts its metabolism, fat accumulates in liver cells. Supplementing choline has been shown in research to partially reverse this intestinal barrier dysfunction, suggesting the depletion itself is a meaningful driver of alcohol-related organ damage.
Low Estrogen Reduces Internal Production
Your body can manufacture some choline on its own through an enzyme in the liver. Estrogen activates the gene responsible for this enzyme, which means premenopausal women have a built-in production advantage. After menopause, that advantage disappears.
The numbers are striking. In a controlled feeding study, 73 percent of postmenopausal women who were not receiving estrogen developed signs of organ dysfunction when placed on a low-choline diet. Among those receiving estrogen replacement, only 18 percent did. Premenopausal women were substantially more resilient. This means postmenopausal women have a meaningfully higher dietary requirement for choline, even though the official recommendations don’t currently distinguish by menopausal status.
Genetic Variants That Raise Your Needs
Common genetic differences can make some people far more vulnerable to choline depletion than others. One well-studied variant affects the gene responsible for the body’s internal choline production. Among carriers of this variant, 78 percent developed organ dysfunction on a low-choline diet, compared to a much smaller fraction of non-carriers. The effect was strong enough to produce a 25-fold increase in risk.
A separate variant in the same gene causes a 30 percent loss of enzyme function and has been linked to higher rates of fatty liver disease. These polymorphisms are common in the general population, which means a significant number of people have higher-than-average choline needs without knowing it. Because genetic testing for these variants isn’t routine, the practical takeaway is that some individuals may experience depletion symptoms even at intake levels that seem adequate on paper.
Certain Medications Interfere With Choline
Methotrexate, a widely prescribed medication for autoimmune conditions and certain cancers, disrupts choline metabolism in the liver. In animal studies, methotrexate treatment alone reduced key choline-derived compounds in liver tissue by 30 to 52 percent. The drug works by blocking folate metabolism, and because folate and choline pathways overlap, disrupting one puts pressure on the other. The fatty liver that sometimes develops as a side effect of methotrexate may be driven in part by this choline disruption.
Other folate-antagonist drugs may have similar effects, though methotrexate is the best studied. People on long-term methotrexate therapy face a double hit: the drug increases choline demand while also impairing the metabolic pathways that process it.
High-Fat Diets Increase Choline Demand
The liver relies on choline to process and export dietary fat. When fat intake is high, the liver needs more choline to keep up. Animal research has shown that supplementing choline during a high-fat diet reduced liver fat accumulation by 50 percent and cut tumor development significantly. Choline supplementation also boosted the liver’s fat-burning capacity, increasing the expression of fat-oxidation genes by 75 to 100 percent.
This doesn’t mean a high-fat diet directly “uses up” choline the way exercise does, but it does mean the body’s functional need for choline rises when the liver is processing more fat. Someone eating a high-fat diet with borderline choline intake is more likely to develop fatty liver than someone with the same choline intake on a moderate-fat diet.
What Depletion Looks Like
Choline depletion causes measurable damage before obvious symptoms appear. The liver is the first organ affected: without enough choline, liver cells can’t properly export fat, leading to fatty liver disease. Blood markers of liver damage rise as cells begin to break down. Muscle cells are also vulnerable. In severe depletion (intake below 10 percent of the adequate intake), a marker of muscle cell damage increased up to 66-fold, indicating significant muscle breakdown. The underlying mechanism is that choline-deficient cells develop weakened membranes, causing their internal contents to leak into the bloodstream.
Patients with cystic fibrosis who have impaired pancreatic function face an additional route of depletion: they lose choline through increased fecal excretion rather than absorbing it normally. For most people, though, depletion is a slow process driven by the cumulative effect of several factors on this list acting together, not just one in isolation.