Oatmeal with fruit in it...but, be prepared. Know where the nearest clean restroom is from wherever you will be for a few hours afterwards. The good news is that your body will get used to it, the bad news is that the first few weeks will be.... extremely regular. EXTREMELY.
Aside from that, it might help to know your specific issue. I have high cholesterol. My "ideal" diet should be low in fats. I was advised to cut bits of fat from my meats and eat leaner cuts. Choose fish or chicken over beef and pork. Do you have health insurance? Your insurance should cover a visit to a dietitian, especially if your doctor recommends it.
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