A year ago my bmi was 18.7 and now its 17.5 and i lost half a stone after having a lot of illnesses this yr-kidney stones, pots, svt, gastroenteritis, bronchitis etc. how can i gain weight healthily?

Ask your doctor: Make sure that after all this illness that you can eat the things that you need to , to gain weight in a healthy fashion. Take into consideration the weight of your family as their BMI may be on the slight side. Protein, poultry , fish, nuts and vegetable are all things you can eat to gain weight. See a dietician for best recommendatinos.

Weight: Make sure that you don't have an overactive thyroid or diabetes. If not, increase daily calorie intake with three healthy meals and add in a supplement like Ensure once or twice daily to take in more calories.

Extra calories: Simple extra calories with your choice of calorie dense food. Can use Ensure/Boost as supplement three times a day.