How Many Carbs Per Day?

How many carbs should I be eating per day to lose weight? I have a lot of weight to lose. I am currently battling Cancer, and on steroids which have contributed to significant weight gain and insatiable hunger.

My diabetes doc said 30 or less per meal and 15 or less per snack. But I have heard diabetics eating 30 or less carbs per DAY.

I am getting married next May as well. Really needing to lose this weight :(