1 Underweight (BMI below 18.5): If you were underweight for your height you should gain 28 to 40 pounds. 2  Overweight (BMI of 25 to 29.9): If you were overweight for your height you should gain 15 to 25 pounds. 3  Obese (a BMI of 30 or higher): If you were obese for your height you should gain between 11 and 20 pounds.
In the UK, the most common causes of malnutrition in children are long-term health conditions that: 1  cause lack of appetite. 2  disrupt the normal process of digestion. 3  cause the body to have an increased demand for energy.
By Dr Ananya Mandal, MD. Malnutrition occurs when a person does not receive adequate nutrients from diet. This causes damage to the vital organs and functions of the body. Lack of food is the most cause of malnutrition in the poorer and developing countries.However, in developed countries like UK or USA the cause may be more varied.For example, those with a high calorie diet deficient in vital vitamins and minerals are also considered malnourished.y Dr Ananya Mandal, MD. Malnutrition occurs when a person does not receive adequate nutrients from diet. This causes damage to the vital organs and functions of the body. Lack of food is the most cause of malnutrition in the poorer and developing countries.