Lipids have attracted a good deal of research interest in terms of their possible effects on psychological function. The main nutrients studied fall into three groups: cholesterol, n-3 and n-6 essential fatty acids, and phospholipids. In general, the theoretical basis underpinning the effects (or lack of effects) of these nutrients on psychological function relates to how their relative concentrations affect cell-membrane fluidity. The rigidity of lipid bilayers of cell membranes is thought to be essential for neurotrans-mitter function because it maintains maximum exposure of receptors at the synaptic cleft between neurones.
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