There have been a rash of articles and announcements today regarding Diacetyl, a chemical used (or created) in foods with "butter flavors", and its role in a serious lung disease. Here is a link to one credible source:
Finding the absolute best ingredients such a big part of Chef Antoine Westermann’s culinary career and the main drive behind all of his expertly crafted dishes. His relationship with farmers and purveyors are critical to his work as a chef. While visiting one of his providers in New York, the French chef describes his efforts to find the best local ingredients for his restaurant.