Scientists are hopeful that "smart" insulins which are undergoing trials could revolutionise the way diabetes is managed.
Instead of repeated blood tests and injections throughout the day to keep blood sugar in check, a single dose of smart insulin would keep circulating in the body and turn on when needed.
Animal studies show the technology appears to work - at least in mice.
Scientists plan to move to human trials soon, PNAS journal reports.
Experts caution that it will take years of testing before treatments could become a reality for patients.
Dr Danny Chou from the Massachusetts Institute of Technology has been testing a smart insulin that he and his colleagues developed in the lab.
It is a chemically modified version of regular, long-acting insulin.
It has an extra set of molecules stuck on the end that binds it to proteins that circulate in the bloodstream. While it is attached to these, the smart insulin is in its switched off mode.
When blood sugar rises, the smart insulin switches on - glucose locks on to the smart insulin and tells it to get to work.
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