The calories of coarse grains vary due to their type, the main role of coarse grains as grains is to provide carbohydrates.
Generally speaking, grain types that are high in fiber such as sorghum, oats, buckwheat, and corn fall into the roughage category. In addition, a variety of miscellaneous legumes such as red beans, mung beans, green beans, etc. also belong to the category of coarse grains.
Black rice, for example, per 100 grams of black rice contains 341 calories, of which 9.4 grams of protein, 72.2 grams of carbohydrates; buckwheat, for example, per 100 grams of black rice contains 337 calories, of which 9.3 grams of protein, 73.0 grams of carbohydrates.
The main role of moderate consumption of coarse grains is to provide carbohydrates and energy for the body, but long-term large intake of coarse grains will make the intake of calories exceeded, which in turn triggered weight gain, and even lead to obesity and other issues.