Urea is the final product of protein metabolism in the human body and is excreted through the kidneys. If a blood test shows that the BUN level is higher than normal, it indicates that the kidneys are not functioning properly, or other underlying disorders.

Calories are a measure of energy used to calculate the body's needs. However, we often encounter two units: kcal and calorie. This can confuse many people about how to use them correctly. So, what is kcal and what is calorie?