Yes calamansi fruit has been shown to be good for people with diabetes.
The calamansi fruit can help regulate the release of your bodies natural glucose and insulin into bloodstream which helps the diabetes.
The calamansi has many other health benefits such as improving your energy levels, boosting your bodies immune system, may prevent other diseases etc.
Eating some calamansi fruit daily can help improve your health as well give you energy and help manage your diabetes.
For those suffering from diabetes eating calamansi fruit is a good thing.