I just saw it BB, sorry for keep you waiting, the elevated Urea is explained from the Red Meat, Beef/Pork etc, I remember when I was still having my own kidneys but underfuctioning Doctors told me to do not eat any read meat cause its elevating the Urea levels I was on strict diet to eat only chicken/turkey and fish, when I told before to have a break on protein I didn't only meant on supplements but from meat also, if he wants his kidneys to "take a break" he should cut totally the read meat and lower his protein intake like 4-5 Days and drink lots of water 3-3,5 litters a Day and then do the blood work.