Dark chocolate (70+% cocoa content) is low FODMAP and should be tolerated by most people.
Dark chocolate is high in saturated fats, which affect gut motility, and might cause flareups in some individuals.
Dark black chocolate (also known as black chocolate, plain chocolate, or sour chocolate) is a form of chocolate containing cocoa solids, cocoa butter, and sugar, without the milk found in milk chocolate. Government and industry standards of what products may be labeled "dark chocolate" vary by country and market.
Although dark chocolate has a reputation as a healthier alternative to other types of chocolate, such as milk chocolate, high-quality evidence for significant health benefits, such as on blood pressure, has not been shown.
The United States Department of Agriculture (USDA) states the nutrients of "Dark chocolate (70–85% cacao solids)" to be 1% water, 46% carbohydrates, 43% fat, and 8% protein (table). In a 100 grams (3.5 oz) reference amount, "Dark chocolate (70–85% cacao solids)" supplies several dietary minerals in significant content, such as iron at 92% of the Daily Value (DV) and vitamin B6 at 29% DV. Dark chocolate contains 70–100% cocoa solids.