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).
If you do not have a sufficient amount of iodine in your diet, adding foods such as cranberries, strawberries, or potatoes that are heavy in iodine can prevent your metabolism from slowing. Another way to change your metabolism is to drink coffee or smoke. Caffeine and nicotine can increase your metabolic rate.