The following is an extract from:
Nutrient Reference Values for Australia and New Zealand
Including Recommended Dietary Intakes
ENDORSED BY THE NHMRC ON 9 SEPTEMBER 2005
Commonwealth of Australia 2006
ISBN Print 1864962372
ISBN Online 1864962437
The Nutrient Reference Values (NRVs) was a joint initiative of the Australian National Health and Medical
Research Council (NHMRC) and the New Zealand Ministry of Health (MoH). The NHMRC would like to
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Choline is a precursor for a number of compounds including the neurotransmitter acetylcholine and the membrane constituents phospholipid and sphingomyelin, platelet activating factor and betaine, which is required by kidney cells and plays a role in donating methyl groups to homocysteine to form methionine. It is also important for lipid and cholesterol transport and metabolism if methyl groups.
There is some evidence that choline may improve cognitive function and memory at all ages and, by extension, choline defi ciency has been implicated in poor performance for groups such as the institutionalised elderly (Fioravanti &Yanagi 2004, McDaniel et al 2003). There is also evidence that choline may reduce serum and urinary carnitine (Hongu & Sachan 2003).
Choline can be made in the body, but the ability of the body to produce enough depends on the methyl-exchange relationships between choline and folate, Vitamin B and methionine (Zeisel &
Blusztajn 1994). The dietary essentiality of choline was demonstrated in a study of healthy men with normal folate and vitamin B status who developed liver damage with lower plasma choline and
phosphatidylcholine concentrations when fed a choline-defi cient diet (Zeisel et al 1991). However, few countries have included choline in their nutrient intake recommendations.
There is little information about requirements for most age and gender groups. Evidence from animal studies suggests that females may have a lower requirement than males. Female rats are less sensitive to choline defi ciency than male rats, perhaps because of an enhanced capacity to form choline de novo
(Tessitore et al 1995). If this is true for women, it is possible that the enhanced capacity may decrease after menopause (Lindblad & Schersten 1976) as animal experiments again have shown that oestrogens increase hepatic phosphatidyl-ethanolamine-N
-methyltransferase activity (Drouva et al 1986, Young 1971).
Choline is widely distributed throughout the food supply, mostly in the form of phosphatidylcholine in membranes. Milk, liver, eggs and peanuts are particularly good sources. Vegetarians consuming signifi cant quantities of refi ned products have a risk of becoming choline defi cient. Wheat germ and dried soybeans are good sources of choline for this group (Zeisel et al 2003). Endogenous biosynthesis of choline does not meet physiological requirements and chronic defi ciency leads to hepatic dysfunction.
Choline is absorbed in the small intestine both intact and after bacterial metabolism to betaine. Some betaine is also formed by oxidation of choline in liver and kidney (Bianchi & Azzone 1964, Weinhold & Sanders 1973). There appear to be no competitors for the choline transporter mechanism in the gut. The tissues of the body accumulate choline by diffusion and mediated transport (Zeisel 1981) and a specifi c carrier mechanism allows transport across the blood-brain barrier. This carrier has very high capacity in the neonate.
Although choline is essential, there appear to have been no reports of defi ciency in the general population. Defi ciencies have been seen in experimental situations and also in total parenteral nutrition (Buchman et al 1992, 1993, 1995, Chalwa et al 1989, Shapira et al 1986, Sheard et al 1986). Individuals with obesity, insulin resistance or diabetes, and middle-aged women have a propensity to develop fatty liver syndrome. This may in part be due to defi ciencies of nutrients such as carnitine, essential fatty acids or choline, but there is little evidence. Given the propensity of visceral obesity in western countries including Australia and New Zealand, consideration of choline intake, amongst other nutrients, needs to be further explored.
Markers of liver dysfunction and plasma concentrations have been used to assess choline requirements, but both have limitations. Animal experiments show that hepatic choline and choline metabolites in liver decrease in choline defi ciency (Zeisel et al 1989). Phosphocholine concentration in liver correlates highly with dietary choline and is also sensitive to modest changes in dietary intake. However, it is not easy to measure (Cohen et al 1995).
Nutrient Reference Values for Australia and New Zealand 113
Plasma concentration of choline varies in response to diet (Buchman et al 1993, Burt et al 1980, Chalwa et al 1989, Sheard et al 1986, Zeisel et al 1991). The disadvantage of using it as a functional marker is that concentrations do not decline to less than 50% of normal, possibly due to hydrolysis of membrane phospholipids to maintain plasma levels (Savendahl et al 1997). Plasma phosphatidylcholine concentrations also decrease in choline defi ciency, but phosphocholine concentrations are also infl uenced by factors that change plasma lipoprotein levels, so it is not a specifi c marker for choline defi ciency (Zeisel et al 1991).
The AI for 0–6 months was calculated by multiplying the average intake of breast milk
(0.78 L/day) by the average concentration of choline in breast milk, and rounding. Breast milk
from well-nourished mothers contains an average of 160 mg/L of choline delivered as choline,
phosphocholine, glycerophosphocholine, phosphatidylcholine and sphingomyelin (Holmes-McNary et
al 1996, Zeisel et al 1986). Infant formulas derived from soy or bovine milk contained signifi cantly less
phosphocholine than human milk (Holmes-McNary et al 1996). The AI was thus set at 125 mg/day
(160 mg/L x 0.78 L/day and rounded), or 18 mg/kg for the reference weight of 7 kg at this age.
Although the free choline moiety is adequately provided by infant formulas and bovine milk, re-evaluation of the concentration of other choline esters, in particular glycerophosphocholine and phosphocholine, may be warranted. As there are no data on the availability of choline from foods for this age group, the AI for 7–12 months was set by using the reference body weight ratio methods to extrapolate either from the AI for 0–6 months or that for adults. This gave a fi gure of 150 mg/day.
Children & adolescents
As there are no data to set EARs, AIs for children and adolescents were set by extrapolating
from the adult data on a body weight basis and allowing for growth needs.
114 Nutrient Reference Values for Australia and New Zealand
As data are too limited to allow the setting of an EAR, an AI for adults was set using
data from experimental studies. In one study, an intake level of 500 mg/day (approximately 7 mg/kg
body weight) prevented alanine aminotransferase abnormalities in healthy men (Zeisel et al 1991).
This estimate is uncertain, but is within the range of adequacy for patients on total parenteral nutrition
for whom 2 mg/kg/day (150 mg/day for the standard body weight of men) did not prevent defi ciency
and 31 mg/kg/day (about 2400 mg/day) did. The AI is therefore set at 550 mg/day for men (7 mg/kg
body weight x 76 kg and rounding up). Animal data have suggested that women may use choline
more effi ciently. The female AI was set using the data from men and adjusting for body weight (7 mg/
day x 61 kg), and rounding.
There are limited data on the needs for choline in pregnancy. The AI is based on the
fetal and placental accumulation of choline plus turnover in the mother. From the data of Pompfret
et al (1989), Widdowson (1963) and Welsch (1976), the combined fetal and placental choline content
has been estimated at 312 mg/kg (FNB:IOM 1998). Assuming there is no additional synthesis in
pregnancy and no contribution from fetal and placental synthesis, the additional requirement is
3,000 mg (assuming a 3 kg fetus and 7 kg organs of pregnancy) which equates to 11 mg/day.
The AI was therefore set by adding 11 mg/day and rounding.
Needs in lactation increase, as a substantial amount of choline is secreted in breast milk.
For an average volume of 0.78 L/day of breast milk with an average choline content of 160 mg/L, the
increase is 125 mg/day which was added to the mother’s requirement.
Nutrient Reference Values for Australia and New Zealand 115
Not possible to establish. Source of intake should be breast milk,
formula and food only
Children and adolescents
Adults 19+ yr
The data used to set the UL included a single case report of hypotension and several studies
involving cholinergic effects and body odour effects after large choline doses. There are no data to
establish a NOAEL. A LOAEL of 7.5 g/day was derived from the study of Boyd et al (1977) of seven
dementia patients receiving choline therapy and reports of hypotension, cholinergic responses and
fi shy body odour in other patients undergoing treatment (Gelenberg et al 1979, Growdon et al 1977a,b,
Lawrence et al 1980). In these studies, intakes of 4 g/day showed no effect in terms of hypotension,
nausea, diarrhoea or other cholinergic effects but at 7.5 g/day or over, these effects were reported in
some patients. A UF of 2 was selected because of limited data, giving a UL of 3.5 g/day (3,500 mg/day)
after rounding down. There are no data to suggest that during pregnancy or lactation, there is increased
susceptibility, so the same UL was set.
For infants, there were no data on which to set a UL. The only source should be breast milk, formula and food. For older children and adolescents, the UL was set on a body weight basis from the adult value, and rounded down.
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118 Nutrient Reference Values for Australia and New Zealand
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