You need to go to this link and apply for an accommodation to be able to bring in what you need like glucose tabs, your testing equipment, insulin pens/ pump etc. That will require a letter from your doctor and listing the various things that you need. For bringing in medical devices and diabetes equipment etc. you need to apply 30 days ahead of time it seems.
I frequently go long periods without eating, usually 4-5 hours between meals normally, I think eating low carb, high fat helps. I like Terry's idea of eating a protein fat meal with low carb content meal before and keep your bolus insulin low to avoid lows. If you have a pump then obviously you can reduce basal if you go low, or increase it or whatever. I guess it all depends on you. Snacks like nuts, cheese and raw veggies can keep me going for hours.
https://www.aamc.org/students/applying/mcat/accommodations/
Application Time Frames and Types
2015 Time Frames
Most initial requests for accommodations will be reviewed within 60 days of submission of a complete application. The review cycle for Reconsiderations, Appeals, and Extensions is 30 days. Remember that submitting an incomplete application may extend this time frame considerably and may prevent you from testing on your preferred test date with accommodations, so pay particular attention to the application requirements that apply to your request.
You must submit your application far enough in advance to allow us time to confirm or arrange your accommodations on your preferred test day. We are not able to begin the confirmation process after your exam’s Silver Zone deadline, as that is the minimum amount of time needed to confirm your accommodations. To help you submit your application on time, please refer to the table below. Submitting your complete application by the date listed will guarantee a decision in time for any approved accommodations to be confirmed for your exam date.
Submission Dates for Preferred Exam Date
Exam Date (2015) 60-day Review Cycle* 30-day Review Cycle**
April 17 & 18 February 16 March 4
May 22 March 9 April 8
June 19 & 20 April 6 May 6
July 17 & 18 May 4 June 3
August 5 & 6 May 23 June 22
August 21 & 22 June 8 July 8
September 3 June 21 July 21
September 11 & 12 June 29 July 29
*Applies to initial applications, including previously incomplete applications.
**Applies to Personal Medical Item Requests, Appeals, Reconsiderations, and Extensions.
Application Types
Initial
An Initial application is your first request for accommodations and is submitted via MCAT Accommodations Online (MAO). The review cycle for an Initial application is 60 days for a complete application, so make sure to submit your application as soon as it is complete, but no later than the date in the table above that corresponds with your test date. To ensure your application is complete when you submit it, make sure to carefully review the Application Requirements associated with your request.
Personal Medical Item
If you have a medical condition that necessitates that you bring a personal item into the testing room and you are not requesting any other accommodations, the review period is shorter (30 days). You can still submit your application via MCAT Accommodations Online (MAO).Your application should include a cover letter along with documentation in the form of a detailed letter from your physician, on letterhead, that explains the rationale for your request. Written notes on prescription paper will not be accepted. Examples of personal medical items include, but are not limited to:
Medication
An insulin pump
A cast
A prosthetic device
An inhaler
Food or beverage
Extension
Your approval letter will specify when your accommodations expire. If you need to extend your approved accommodations beyond the specified date, you may submit an Extension Request. Before doing so, make sure the documentation you submitted with your initial application is still current. If the documentation is not current, you may need to submit updated information. Then, complete the form below and mail it to the address on the form. The review cycle for an Extension is 30 days.