Celery was regarded as an ideal dieter food as early as the 60's. Its crunchy nature being due to its high water and fiber content. It is also pretty high in potassium and some calcium & iron, helping kidneys and fluid retention.
Chicory was originally grown in Europe, specifically for its root. It was served many different ways - baked, stir-fried, or poached. Then by the 18th century, the root was roasted and added to the coffee, correcting the over-stimulation of coffee.