We test coffee beans as a whole and do not distinguish between coffee and caffeine. It could be that you react to both elements or only one of them. At the start avoid both. Wait for at least 3 weeks, or until your symptoms have stabilized, and then try a drink with caffeine in it.nnCoffee itself is not recommended, even if no reaction was detected in the test. Its roasting substances have an irritating effect on the intestinal mucosa and increase the permeability of the intestine for foodstuffs. They also increase the acid production in the stomach, leading to heartburn, bloated feeling, and sickness and additionally straining the intestinal mucosa. Our experience has shown that going without coffee has a positive effect. The stimulating effect of caffeine can be obtained by drinking black or green tea – drunk in rotation and not every day.