At popular Los Angeles restaurant Sushi Gen, 66-year-old Toshiaki Toyoshima slices fish in preparation for dinner. The chef has honed his sushi-making technique for nearly 50 years and the daily long lines of customers are a testament to that.

But to Toyoshima, the sushi he makes no longer feels like it is made by his own hands.

Thanks to a California law that took effect Jan. 1, chefs like Toyoshima are required to wear gloves when making sushi.