Do You Have to Eat Carbohydrates to Succeed With Intermitting Fasting?

I think the greatest success that i've seen has been 16 to 18 hours for fasting. Do you have to eat low karb to succeed with intermitting fasting? I just think the best combination n is a low car diet. Usually we focus on forty grams, 50 grams or less per day of carbohydrates,. plus the plus the time restricted eating.