casien protein and fasting

hi

I would just like to know if casien protein is necessary to have while fasting or can I stick to whey protein with some fats to slow down digestion..

thanks

You can have water and whey & you'll be fine. Don't think fasting deserves the stigma and confusion that surrounds it. Are you worried about "catabolism"? Ensure at least daily intake of 0.6g protein/ lb bodyweight, spread that more or less equally amongst meals. More than that won't add such a big difference.