A Romulan with blood on his face. Nanoprobes assimilating blood cells. Blood is the circulatory fluid that runs through most corporeal lifeforms in the universe. Its primary function is to carry nutrients and respiratory gases to cells and to remove waste products.
Muscle is more metabolically active than fat, and building muscle can help increase your metabolism (36, 37, 38, 39). This means you will burn more calories each day, even at rest (40). Lifting weights will also help you retain muscle and combat the drop in metabolism that can occur during weight loss (41, 42, 43, 44).
Along with exercise, you can follow some dietary guidelines to increase your metabolic rate. For instance, small, frequent, meals help keep your metabolism in high gear, and that means you'll burn more calories overall. When you wait too long between meals, your metabolic rate slows down to compensate. The best advice is to eat 3 regular meals and a couple small snacks each day.