The production of lactose by the mammary gland does not require the ingestion of milk or milk products.
The woman will be able to breastfeed her baby because she can produce lactose from amino acids and other carbohydrates. She will not have to eat pure galactose or even lactose to do so. Glucose, which can be provided by gluconeogenesis or obtained from the diet can be converted to UDP-galactose.
UDP-galactose reacts with free glucose to form lactose. α-Lactalbumin is a protein that serves as the modifier of galactosyltransferase, which catalyzes this reaction. The amino acids of α lactalbumin can be used to produce glucose, but the immediate products of α-lactalbumin degradation are not lactose. Carbohydrates cannot be synthesized from fats.
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