Which condition is characterized by eating a lot but experiencing weight loss?

Hyperthyroidism is characterized by an overproduction of thyroid hormones, which significantly accelerates metabolism. Individuals with hyperthyroidism often experience increased appetite, consuming more food than usual. However, despite their increased caloric intake, they can lose weight due to the elevated metabolic rate, which leads to the body burning calories more quickly than they can be consumed. This condition can manifest with other symptoms such as increased heart rate, anxiety, tremors, and heat intolerance, contributing to the overall clinical picture.

In contrast, conditions like hypothyroidism are associated with weight gain due to a slowed metabolism, diabetes mellitus might lead to weight loss but typically is also associated with other factors like polyuria and thirst, and adrenal insufficiency generally causes fatigue and weight loss but is not primarily characterized by excessive eating. Thus, hyperthyroidism distinctly correlates with both high appetite and unintended weight loss.