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As per your height and weight , your Body Mass Index
(BMI) comes to 18.3.Ideal body weight of your height should be between 65kg to 70kg.
Increasing weight in a healthier way is to have food which is high in protein.Proteins
actually helps in building muscles and improves immunity.Foods rich in protein should be included in your diet.
Whole pulses, legumes, milk and milk products like curd, buttermilk, paneer;soya products like soy milk, tofu;nuts like groundnuts, almonds, walnutsand dry fruits;high calorie fruits like banana, seethaphal, sapota,avocado should be included.Aviod junk foods like carbonated drinks, oily fried snacks,pizza's,highly saturated sweets instead substitute with boiled chole,boiled groumndnuts,lassi, fruit milkshake,low fat yogurts,flavoured soy milk,chesse sandwich, dry fruit milkshakes, gronudnut chikki/burfi,any fruit like green banana.
also help to gain weight.Supplements like ENSURE or RESOURCE HIGH PROTEIN are easily available in pharmacy which can be taken mixing the above protein powder with milk or water as directed and should be taken at least twice a day.