The quick answer to that question is no. It's not possible for a human to have 0% body fat and still be alive. That's because essential fat is necessary for normal physiological function, and even the leanest athletes typically have at least 5-10% body fat. Having too low body fat can lead to a variety of health problems, including hormonal imbalances, decreased immune function, and organ damage. Those with the least amount of body fat are bodybuilders because the leaner the body, the easier it is to see the muscles. Their diets are typically low in fat and high in protein, leaving most of them with a shocking 4% body fat. To put that into perspective, a healthy body fat percentage for men 40-59 years old is 11% to 21%. For the average person, anywhere from 8% to 35% body fat is normal, depending on gender and age.
