My friend is having frequent low blood sugar level. how can i help him?

Is he diabetic?: Perhaps he is on too much Insulin or oral agents. Have him talk to his doctor.

4 reactive hypoglyce: Eat only meat or fish or cheese or eggs or poultry and low starch veggies, drink only water. In other words avoid all carbs, carbs will only briefly raise your sugar levels and then your Insulin levels. The fats in the meat or fish or cheese or eggs or poultry will act like a "log on your metabolic fire" to keep your blood sugar stable for hours without raising insulin.