Why should I get choline and betaine in my diet during pregnancy?

?? Just eat a balanced diet of protein, fat, and carbs. This is a new one on me.
Methylation. Choline is synthesized from methonine and serine and is also present in the diet. It is the precursor of acetylcholine, phosphatidylcholine, sphingomyelin, platelet activating factor, and sphingosylphosphorylcholine. It functions as a methyl group donor, and is a precursor for betaine, which is also a methyl group donor. Methylation is a critical function.