Excessively limiting calories can lead to numerous health consequences, including malnutrition, muscle loss, and metabolic slowdown. When the body does not receive sufficient energy, it enters a state of "starvation mode," conserving energy and slowing metabolism to survive, which can hinder weight loss efforts. Additionally, dramatically reducing caloric intake can result in deficiencies in essential vitamins and minerals, adversely affecting overall health. Sustainable, gradual changes to diet are recommended for lasting weight management without health risks.