Yes, you are approximately 9kg below the weight for your height. Suggest weight lifting which will build lean muscle mass and you will gain weight (muscle weight more than fat). For your age you need 2900 calories per day. Recommend drinking Ensure or make your own milkshakes (milk, fruit, and ice cream blended) or yogurt smoothies (yogurt, fruit, and ice cream blended) 2 times a day for additional calories. Recommend eating a Heart Healthy diet which will give you the nutrients, vitamins and minerals your body needs, gain weight slowly, and help with possibly preventing future disease states. Heart Healthy diet which is a moderate fat diet and a moderate fat diet means = using polyunsaturated (omega 3, corn oil, nuts, etc) fats and monounsaturated (olive oil, canola oil, peanut oil, etc) fats, no saturated fats (high fat snack foods, butter, fat spreads) and no trans fats. Eat low fat meats (chicken, fish, loin of pork) or non-meat sources (soy products, nuts), low fat vegetarian combinations (rice & beans, pasta & beans, low fat cheese & pasta), low fat and substitute dairy products (1% milk, low fat/fat free yogurts, low fat soy milk/soy yogurt), use plant oils, non trans-fat margarines, and eat a lot of fruits and vegetables. Eat daily high fiber breads and cereals (oatmeal). Hoped this helped you.