Hi im dr.hema physiotherapist.
Welcome to HCM.
You can increase your weight by diet and exercises.
Always remember to maintain your BMI.
Take healthy fats that can be obtained from foods like peanuts, cashews,and olive oil. Stay away from saturated fats (bad fats) gained from processed foods, fries, high calorie foods.
Go for high-protein. Though it's a myth that protein builds muscle, it is an essential part of your diet.it's a building block of our entire body: muscles, bones, skin, hair, and blood.
This doesn't mean eating junk food and sugars; it means lots of protein and carbohydrates.
Weight training will develop some of your muscles.
Do push-ups, crunches, lunges, and squats in the comfort of your own home while watching TV or join gym.
Exercising also builds up your appetite. After a workout, slam a protein bar or shake to give your muscles what they're craving. Increase your workout as you progress.
Have good sleep everyday.
Hope it helps you.
In doubt do reply.