Cocoa can be a pure unsweetened powder used for cooking and baking, or it can be a sweetened drink usually made with milk.The pure unsweetened cocoa powder, which has hardly any fat, actually has a relatively high amount of fiber. Although high in fat, pure unsweetened chocolate (used for melting) is also high in fiber. Yet most candies and drinks are higher in fat, sugar or milk than in chocolate, and they have hardly any fiber.I've actually found benefit in consuming a nondairy, nonfat chocolate sorbet, which has about 4 grams of fiber (all from cocoa) per cup. I think the fiber is helpful. I notice it does darken the stool though.So it basically depends on what type of cocoa one consumes and what product it is in. Milk products, fats, and a number of other ingredients in the product may trigger IBS symptoms. You might want to experiment trying something low fat without dairy or milk (like a chocolate sorbet). I would assume people likely don't actually eat powdered unsweetened cocoa by itself.