You body uses glucose for energy, but too much glucose in your blood is harmful for both you and your baby while you are pregnant. (natural-parenting-advice.com)
In case you're not familiar with a keto or ketogenic diet, it simply means that instead of using glucose as fuel, your body burns fat instead. (insonnetskitchen.com)
When you eat a high carbohydrate diet, your body uses glucose for energy, because it is a lazy source of fuel. (queenketo.com)