Final answer:
Treating galactosemia with dietary restriction involves avoiding foods containing galactose, as individuals with galactosemia lack the enzyme needed to convert galactose to glucose. By doing so, they can prevent symptoms such as diarrhea and vomiting.
Step-by-step explanation:
Treating galactosemia involves a dietary restriction of galactose, a sugar found in milk and other dairy products. This is because individuals with galactosemia lack the enzyme needed to convert galactose to glucose. By avoiding foods containing galactose, they can prevent the accumulation of galactose in their blood and the associated symptoms, such as diarrhea and vomiting.