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With the information that you have given , your Body Mass Index
( BMI ) is 14, which is on the lower side ( normal BMI is 18.5-24.9 ).Here are some tips to increase your weight.
Try to avoid junk foods like oil fried foods and carbonated drinks instead go in for fruit milkshakes , soy flavoured milk , try taking full fat milk and milk products, Include more of protein rich foods in the diet like pulses, legumes , paneer , lean meats and egg in form of custards. Try taking small frequent meals instead of three big meals, include more of dry fruits and nuts daily in your diet .Avoid taking high concentrated sugary and fatty food items which will suppress your hunger.