What causes difficulty in gaining weight at 23 years old, and what can I do to increase my weight from 45 kg?

Maintaining a healthy weight can be complex, and several factors might contribute to your difficulty in gaining weight. At your age, it’s essential to rule out underlying medical conditions that might affect your metabolism, absorption, or appetite. Issues such as hyperthyroidism, gastrointestinal disorders like celiac disease or Crohn’s disease, hormonal imbalances, or even metabolic conditions could play a role. Consider getting a comprehensive physical exam with some specific tests like thyroid function tests, complete blood count, liver function tests, and even a stool test for malabsorption conditions. These could help pinpoint any medical causes behind the weight stagnation. Additionally, despite eating a lot, the quality and nutritional content of your diet could be influencing your weight. Incorporate high-calorie and nutrient-dense foods like nuts, avocados, lean meats, whole grains, and healthy oils into your meals. Protein shakes or smoothies can also be a suitable addition. Eating more frequently, perhaps 5-6 small meals a day, ensures a steady supply of calories. Strength training exercises can help build muscle mass, which might aid in increasing your weight. In some cases, appetite-stimulating medications might be considered, but this should be discussed with your healthcare provider. Be cautious of stress levels and psychological factors like anxiety or depression that can significantly impact your appetite and eating habits. If you’ve tried lifestyle changes without success, a visit to a dietitian, alongside your doctor, might provide tailored interventions. Remember, any sudden or severe changes in weight need prompt medical evaluation to rule out serious conditions.