Sure, sugar's bad for you. But should we establish a drinking age for sugary sodas? According to UC San Francisco pediatric endocrinologist Robert Lustig, the answer is emphatically yes. He says that added sweeteners have health effects comparable to alcohol and tobacco, and should be regulated accordingly. In a comment piece for the journal Nature, Lustig and his colleagues argue that the state should selectively block access to sugar, using some pretty stiff rules.