The sentence that requires semicolons instead of commas is:
"A well-balanced diet includes root vegetables, such as carrots, dark red fruits, such as strawberries, and whole grains, such as brown rice."
This sentence contains multiple items in a list, and the items themselves contain additional commas, which can lead to confusion. Using semicolons would help clarify the separation between the main items in the list.
So, it should be revised to:
"A well-balanced diet includes root vegetables; such as carrots; dark red fruits; such as strawberries; and whole grains; such as brown rice."
(Note: If structured correctly, even more clarity can be achieved with rephrasing.)