If you do a lot of testing
for awhile then you will get more familiar with
foods and how they affect you.
Having said that; what raises blood sugar is carbohydrates, so as a rule (diabetes is all about exceptions to rules!) the more carbs you take in, the higher your blood sugar. High carb foods include pasta, potatoes, rice, cereal, bread and sweets. Some people find they can eat whole grains with less effect than white versions of these foods; some find it makes no difference.