What is the likely reason Liz regained the weight she lost from the program?

The reason Liz likely regained the weight she lost from the program is that she might have lost mostly water weight. When individuals begin a weight loss program, especially if it involves a significant reduction in carbohydrates or caloric intake, they can initially lose a substantial amount of weight quickly. This rapid weight loss is often due to a decrease in glycogen stores, which are stored with water in the body. For every gram of glycogen lost, approximately 3-4 grams of water are released.

Thus, if the weight loss was primarily water weight, it is relatively easy to regain that weight once normal eating patterns resume, as the body restores its glycogen levels, along with the associated water. This can create the illusion of regaining weight very quickly, even if the individual has not resumed unhealthy eating habits or gained fat mass. Understanding this concept is crucial for individuals embarking on weight management, as it emphasizes the importance of focusing on sustainable fat loss rather than temporary changes that can lead to quick rebounds in weight.