By Suzana 
The most basic principle of weight gain is to consume more calories than you burn. This means eating more food than your body needs to maintain its current weight.
Eat More Frequently
Instead of having three large meals a day, try eating five or six smaller meals. This will help you consume more calories throughout the day and keep your metabolism revved up.
Prioritize Protein
Protein is essential for building and repairing muscle tissue. Aim to include a source of protein in every meal and snack. Good sources of protein include lean meats, poultry, fish, eggs, beans, lentils, tofu, and Greek yogurt.
Don’t Skip Meals
Skipping meals can actually slow down your metabolism and make it harder to gain weight. Make sure to eat breakfast, lunch, and dinner, and don’t skip snacks if you’re feeling hungry.
Include Healthy Fats
Healthy fats are essential for energy, hormone production, and cell function. Include sources of healthy fats in your diet, such as avocados, nuts, seeds, olive oil, and fatty fish.
Hydrate Throughout the Day
Water is essential for many bodily functions, including digestion and nutrient transport. Aim for at least 8 glasses of water a day.
Strength Training
Strength training is essential for building muscle mass, which helps increase your metabolism and burn more calories, even at rest. Include exercises that target your major muscle groups, such as squats, lunges, push-ups, and rows.
Get Enough Sleep
Sleep deprivation can disrupt your hormones and make it harder to gain weight. Aim for 7-8 hours of quality sleep each night.
Manage Stress
Stress can affect your appetite and metabolism. Find healthy ways to manage stress, such as exercise, yoga, meditation, or spending time in nature.
Listen to Your Body
Pay attention to your hunger and fullness cues. Eat when you’re hungry and stop when you’re comfortably full. Don’t force yourself to eat if you’re not hungry.
Be Patient and Persistent
Gaining weight takes time and effort. Don’t get discouraged if you don’t see results immediately. Stay consistent with your healthy habits, and you’ll eventually reach your goals.
Seek Professional Guidance
If you’re struggling to gain weight on your own, don’t hesitate to seek professional help. A registered dietitian or a certified personal trainer can provide personalized guidance and support.
Embrace a Positive Mindset
A positive outlook can make a big difference in your overall health and well-being. Focus on the good things in your life, practice gratitude, and cultivate a sense of optimism. Think of a positive mindset as a shield against stress and negativity.
Make Healthy Habits a Lifestyle
Don’t think of healthy living as a temporary diet or exercise program. Instead, make it a way of life. Incorporate healthy habits into your daily routine and make them a part of your identity. Think of healthy living as an ongoing journey, not a destination.