but sugar has to go out, and...this
is a diet trial, not
a life-long regime.
Starch from potatoes
is easily broken down to glucose, so I mentioned it. Corn and bean yield gas more from fibers than from carbohydrates, so use the common sense. No need to avoid startch 100%.
Rice may be ok as a basic food. Also whole grain bread. Meat, fish, eggs. Cooked vegetables, like carrot.
Suggestion: start with 2., if no improvent in 3 days, proceed with 3., if still nothing, procedd with 4.