The less type of foods we consume during a meal, the better and easier the digestion process is. Each food, including the ones from the same group, is digested by a different set of ferments.
My personal advice is to have a salad or fruits or even a non-fat meal. Cut down on meat since it contains a whole lot of toxins. If you have difficulty doing it, you can at least pair it with a green salad in proportions 1:3 (always serve the meat with a fresh salad - 300 gr.)
Examples of excellent combinations are salads or soups with non-fat meals, etc.
Some quite bad combinations of foods are, for example, bread with mayonnaise, Bulgarian Kashkaval cheese, fried bacon with a blueberry jam. I don't even advise the youngsters to eat them, although they have no digestive problems. Make yourself a favor - don't burden your body like that and you will live longer!