dietitians can help individuals regain and maintain a healthy weight. Weight loss diseases, also known as involuntary weight loss or unexplained weight loss, refer to medical conditions that cause a significant and unintentional reduction in body weight. While many people strive to lose weight for health or aesthetic reasons, weight loss diseases are a cause for concern as they often indicate an underlying medical issue. Here are a few notable weight loss diseases: Cancer-related cachexia: Cachexia is a multifactorial syndrome commonly associated with advanced stages of cancer. It involves the progressive loss of body weight, muscle wasting, and metabolic changes. Cancer cells can alter the body's metabolism, leading to a higher energy expenditure and reduced appetite. Cachexia negatively impacts a patient's quality of life and treatment outcomes. Hyperthyroidism: This condition occurs when the thyroid gland produces excessive amounts of thyroid hormones. It can accelerate the body's metabolism, resulting in unintended weight loss despite an increased appetite. Hyperthyroidism may also cause symptoms such as increased heart rate, irritability, and heat intolerance. Malabsorption disorders: Certain gastrointestinal disorders like celiac disease, Crohn's disease, and ulcerative colitis can impair the body's ability to absorb nutrients properly. This malabsorption can lead to weight loss, nutrient deficiencies, and other digestive symptoms. Individuals with malabsorption disorders may experience abdominal pain, diarrhea, and fatigue. Chronic obstructive pulmonary disease (COPD): COPD is a progressive lung disease that includes conditions like chronic bronchitis and emphysema. People with COPD often experience weight loss due to increased energy expenditure related to breathing difficulties. The effort required to breathe can lead to a decreased appetite and inadequate calorie intake, resulting in unintentional weight loss.