The calories in wine come from carbohydrates (4 calories/gram) and alcohol (7 calories/gram). This often changes after awhile and sometimes closed or light wines on the nose will open up as they age of. And darker meats, for example beef, are eaten with darker wines, which are usually red. https://blogfreely.net/parkstone7/ruou-cognac-bieu-tuong-cua-su-sang-trong-va-tinh-te