Why is it not advisable for Liz to lose every ounce of fat from her body?

The reasoning behind the selection of essential fat as the correct answer lies in the critical role that certain levels of body fat play in overall health. Essential fat is not merely excess energy reserves; it plays a vital role in various physiological functions. This type of fat is crucial for protecting organs, regulating body temperature, producing hormones, and facilitating nutrient absorption.

Having some body fat is necessary for the body to function properly. Losing every ounce of fat would lead to detrimental health consequences, as the body would lack the essential fat needed for these crucial functions.

The other reasons mentioned do not capture the importance of maintaining a healthy level of essential fat. While fat serves as an energy store and an excess can contribute to obesity, it is the essential fat that must be preserved to maintain optimal health and support bodily functions. Fat's role in digestion is not as significant as its other functions, making it less relevant to the question at hand.