Cooked white rice, typically referring to the refined grain that has had its husk, bran, and germ removed, serves primarily as a staple carbohydrate source, providing readily available caloric energy. A standard half-cup serving (approximately 100 grams cooked) yields about 130 calories, overwhelmingly sourced from its carbohydrate content, which sits around 28 grams.

The refinement process significantly reduces the content of dietary fiber, vitamins (especially B-complex), and minerals compared to its whole-grain counterpart, brown rice. The fiber content in this portion is minimal, generally less than 0.5 grams, classifying it as a low-fiber food. This low fiber, coupled with its high starch content (primarily amylopectin and amylose), means white rice typically has a moderate to high glycemic index, leading to a relatively swift rise in blood glucose levels upon consumption. For individuals managing glycemic load or insulin response, pairing white rice with high-fiber vegetables or lean protein is advisable to mitigate this rapid absorption.

In terms of macronutrients, it is virtually fat-free, containing less than 0.3 grams of total lipids, with negligible amounts of saturated or polyunsaturated fatty acids. Protein content is modest, hovering around 2.7 grams per serving, and while it provides essential amino acids, it is often incomplete in terms of total profile, particularly lysine, making protein complementarity important in meal planning.

Micronutrient contributions, unless the rice is enriched (often mandated in commercial products), are limited. However, it still offers small amounts of crucial minerals like manganese, which is essential for bone health and metabolism, and trace amounts of B vitamins like niacin and B6. It is naturally very low in sodium and cholesterol, making it a heart-healthy base for meals when portion sizes are controlled and added fats/salt are limited. From a hydration perspective, cooked rice boasts a high water content, accounting for over 68% of its total weight.