Crunchy muesli, really healthy, really Swiss?

Originally, muesli was a Swiss invention: "birchermuesli", a recipe developed by Dr. Bircher in the early 20th century to improve his patients' health, and which conquered Europe. But is granola really the healthy product it's advertised to be? According to nutritionist Laurence Genton, products of this type generally lack fiber and are too rich in fats and sugars.