There are three issues concerning what you eat the day of the flush:
1. Ease of digestion. You need to eat in a manner that will allow for speedy digestion of the food you eat on the day on the day of the flush. This is required to ensure that your bowel has an easy time prior to dealing with the Epson salts and flush potion. Having any food in the stomach and upper gut may cause some unnecessary discomfort. In general you have to cater for two meals; breakfast and lunch. The best way to ensure a speedy digestion of food is to avoid large complicated meals. For example, a mixture of protein, carbohydrate and acid fruit (including tomatoes) can lie in the stomach for 4 hours. In many respects fat isn't the problem because our digestive system is design to process it.
2. Avoid nausea. It is important not to consume anything that is going to contribute to nausea after the flush potions are taken. This reinforces the requirement to eat simple meals that are digested quickly and don't cause dehydration. Eating large amounts of carbohydrate requires the intake of addition water.
3. Conserve bile. The protocol requires that the food eaten doesn't reduce the bile pressure and flow to a level that reduces the effectiveness of the flush. That means restricting ones fat intake.
These three conditions if taken literally can make eating decisions on the day difficult but remember that the flush protocol is design as a one-size-fits-all. In my opinion there is room for manoeuvre and you can eat a little fat, for example, as yoghurt, as a salad dressing, as butter on bread, etc. The key is moderation; after all you don't want to blow-out the flush for the sake of two meals. The consensus of the group is to food combine on the day of the flush, which suits vegetarians and carnivores alike. I follow the Hay recommendation as follows:
THE HAY RULES FOR HEALTH
Starches and sugars should not be eaten with proteins and acid fruits at the same meal.
Vegetables, salads and fruits (whether acid or sweet) if correctly combined should form the major part of the diet.
Proteins, starches and fats should be eaten in small quantities.
Only whole grains and unprocessed starches should be used and all refined and processed foods should be eliminated from the diet.
Not less than four hours between starch and protein meals.
Milk does not combine well with food and should be kept to a minimum.
Don't mix foods that fight, see below chart.
Mix anything from List A with List B
Mix anything from List C with List B
Never mix List A and C!
Mix vegetables or salads with pulses i.e. beans/lentils - make these and unprocessed foods the main part of your diet.