Jean S., RD, LD replied:
At stage 3 chronic stage disease (CKD), there is a moderate decrease in your glomerular filtration rate (GFR) and it may not be necessary to modify your diet at this point unless you have been instructed to do so. If you are monitoring your fluid intake you would have to count this as part of your fluid allowance. Also, 8 oz of coffee has 115 mg potassium if you are on a potassium restriction. You can decide how much coffee to drink based on whether you have to monitor fluid or potassium intake. If caffeine is a problem, you can always use decaffienated coffee.