about diabetes blood glucose monitor

  1. abc
    people with diabetes ,how often monitor his blood glucose ?for example,before breakfast or lunchtime or suppertime or bedtime.and why to do it this way?when the person with diabetes needs to inject insulin ,which time's blood glucose should be referred?the time before meal or after meal?
    what's meaning for the blood glucose before meal and after meal?i'd like to get some suggestion from you !thank you
    marymay
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