Protein water: miracle or marketing ploy?

Protein is all the rage, and is being added to an ever-increasing number of food industry products. Pasta, bread, popcorn, cookies, dairy products, potato chips... These protein-enriched foods have long since left the fitness room to squat on supermarket shelves and appeal to the widest possible audience. Johanna Commenge has discovered that there are even protein waters. Miraculous waters or a marketing ploy?