This looks like the same code @Devi_Sree posted at Julia run using terminal for 1GB dataset showing out of memory error - #5 by StefanKarpinski. As people in that thread said, it’s hard to help unless you post a fully reproducible example. Perhaps you could place your data file diabetics2.csv on the internet and provide a URL, or provide short piece of code that would generate a random csv file of the same size.
It would also help if you formatted your code by enclosing it in triple backticks, e.g. ``` <code>```.