Read the following context and answer the question.
Context: Kevin 's old jazz record , floated to his ears from the library where his older brother sits reading their father 's worn copies of Plath and Salinger . Nick was in the dinning room , working on an essay and keeping his insulin levels balanced with Lays and bottled water ; they were out of Diet Coke , much to his annoyance . Just as he 's shoving the biggest potato chip he 'd ever seen into his mouth , Joe wandered in and snatched it from his fingers , grinning and taking a swig of the regular Coke he was allowed to drink . The stupid bastard .
Question: Why is Nick required to maintain his insulin levels ?
Answer:


Because he has diabetes and needs to do so to stay alive , or else he will have a serious medical issue