Another role for Metformin?

Bianca Rotar with her baby Lexi who was born prematurely at nearly 28 weeks.

Preeclampsia is a common condition in pregnancy and there is a possible role for Metformin, a commonly used drug in diabetes. It tends to bring down glucose levels at the tissue level.

I wonder if the researchers have looked at lowering carbohydrate and sugar intake to get the same effect?