If you're looking to gain weight in a healthy way, here are some tips to help you:

1. Increase calorie intake: To gain weight, you need to consume more calories than your body burns. Calculate your daily calorie needs and aim to eat an excess of 250-500 calories per day.

2. Focus on nutrient-dense foods: Choose foods that are rich in nutrients and calories. Include lean proteins, whole grains, healthy fats, and a variety of fruits and vegetables in your diet.

3. Eat frequent, larger meals: Instead of three large meals, try to eat five to six smaller meals throughout the day. This can make it easier to consume more calories.

4. Include protein-rich foods: Protein is important for building muscle mass. Include lean meats, poultry, fish, eggs, dairy products, legumes, and plant-based protein sources like tofu and tempeh in your meals.

5. Include healthy fats: Incorporate sources of healthy fats into your diet, such as avocados, nuts, seeds, olive oil, and fatty fish like salmon. These foods are calorie-dense and provide essential fatty acids.

6. Choose calorie-dense snacks: Snack on foods that are high in calories but also provide nutritional value. Examples include nuts, nut butter, dried fruits, trail mixes, granola bars, and yogurt.

7. Drink calorie-rich beverages: Include smoothies, milkshakes, and fruit juices in your diet. You can add ingredients like protein powder, nut butter, yogurt, or avocado to increase the calorie content.

8. Resistance training: Engage in regular strength training exercises to build muscle mass. This can help you gain healthy weight by increasing lean body mass.

9. Be consistent and patient: Gaining weight takes time, so be patient and consistent with your efforts. Consistently meet your increased calorie goals and stick to a regular eating schedule.

10. Consult a healthcare professional or registered dietitian: If you're struggling to gain weight or have specific dietary concerns, consider seeking guidance from a healthcare professional or a registered dietitian who can provide personalized advice based on your individual needs.

Remember that weight gain should be done in a healthy and gradual manner. Avoid relying on unhealthy, high-sugar, or processed foods, as they can lead to weight gain but may negatively impact your overall health. Focus on nourishing your body with a balanced diet and engaging in regular physical activity to support your overall well-being.