As for your doctor's advice to consume
sugar, including rasgulla, this might be related to the idea of quickly increasing your calorie intake to help with weight gain, especially if you're underweight due to
liver issues. The rationale may be to provide easily digestible sugars that don't burden the liver too much while providing energy. However, if you're concerned about the amount of sugar, you could ask for alternative ways to gain weight that might be more suited to your overall health, especially considering your liver condition.