The edible green stalk of the plant is commonly referred to as celery.

Both vegetables are very nutritious but, as usual, the root is relatively rich in carbs and sugars while the green’s percentage share of the dietary fiber in carbs is much higher.

Both types of celery can be eaten raw or cooked. You can use them as an ingeredient in soups or fresh salads.

Celery (raw) Nutrition Data →

Though it has never been proven, celery is supposed to help fighting hangovers. You might have noticed the practice of putting celery sticks in a Bloody Mary.

Celery, as well as celeriac, contain some natural sodium in them. Also, both are a natural diuretics.

Celeriac (raw) Nutrition Data →

Because of somewhat significant amounts of carbohydrates in celeriac, this vegetable should not be consumed in excessive amounts during the Cruise Phase.

You can, and should, eat it but, in order to keep your weight loss steady, do not go crazy with it.