Chefs cannot wear watches or other Jewelry on their wrist do to food hygiene guidelines.
According to food hygiene guidelines "Staff should not wear watches or jewellery when preparing food (except a plain wedding band).
Watches and jewelry can collect and spread dirt and harmful bacteria, and fall into the food.
When I worked at a restaurant preparing food I was not allowed to wear watches or other Jewelry.
When preparing food in a restaurant you should not wear watches or bracelets on your wrists.
That includes smart watches, fitness trackers, and medical bracelets, especially if they have moving parts.
Like rings, watches and bracelets can harbor food particles and germs, which can then spread to food.