Is drinking coffee/caffeine bad for your kidneys?

This is a question that often comes up when I see patients in my office for treatment of chronic kidney disease (CKD). As always, I tend to emphasize the huge role that diet plays in the management of CKD. I noticed that my recent posts might be becoming too wordy, so I am going to keep myself very brief today!


Ever since coffee was discovered over a millennium ago in Ethiopia, pages upon pages have been written about the myriad health effects of caffeine. Being a psychoactive substance, caffeine has been regulated and even banned for multiple reasons ranging from the religious, to its effect on "overstimulating the senses". Books have been written about even the "sexual hysteria" it could cause! 


But lets talk about it from an objective, health perspective. I am going to restrict myself to the cardiovascular and renal effects of coffee (the effects of coffee are dose dependent; please note that a single, 8 oz cup of coffee has about 100-200 mg of caffeine). 


Image courtesy of amenic181/ FreeDigitalPhotos.net



CARDIOVASCULAR EFFECTS, BLOOD PRESSURE, AND KIDNEY DISEASE

There is some evidence that caffeine can cause momentary increases in the blood pressure (up to 10 mm Hg), especially in people who are not habitual coffee drinkers. However, this effect is enhanced in the elderly, and people who have underlying hypertension. Beyond this short lived spike in blood pressure, there is some data that caffeine could have a long term chronic effect on raising the blood pressure as well.

Given hypertension's deleterious effects on the kidneys', it would seem plausible that moderating caffeine intake could indirectly have a beneficial effect on the kidneys. However, despite the possibility of these kidney damaging effects of caffeine that would "make sense", the evidence has not quite panned out that way. And so, if we look at the aggregate data available at this time, it would appear that consuming the equivalent of 3-4 cups of coffee daily does not increase the risk of kidney disease. This applies to the average person. There still are special situations like kids and the elderly where caution needs to be taken given the other cardiovascular and diuretic effects. A similar rider might also apply to people who are at risk of forming kidney stones. 


My take home message: if you don't fit any of the special categories mentioned above, it is probably safe to consume moderate amounts of coffee from a kidney standpoint! 


Nephrology
Bradenton / Sarasota, FL

Comments

  1. Uncle ElroyNovember 30, 2014 at 6:31 AM

    I have stage 3 CKD/Failure-- I'm not sure, based on what you wrote here, whether drinking moderate amounts of coffee is safe for me, or would be detrimental to my kidneys... could you please elaborate and address those with CKD?? Thanks!

    ReplyDelete
    Replies
    1. DrVCNovember 30, 2014 at 9:18 AM

      Regular coffee, under 4 cups per day does not have a direct deleterious effect on the kidneys. However, if you suffer from high blood pressure, caffeine intake does worsen blood pressure control, so you might need to watch that.
      Thanks!

      Delete
  2. UnknownDecember 5, 2014 at 10:23 AM

    I have ckd stage 3, and due to my hypertension, I decided not to take coffee or tea anymore since it raises my blood pressure, but Dr. Chauhan, what about decaffeinated coffee or tea (not dark)?

    ReplyDelete
  3. marvin ronaldMarch 11, 2015 at 5:25 AM

    only 1 kidney left, is coffee bad for me sir/doc?

    ReplyDelete
    Replies
    1. DrVCMarch 21, 2015 at 1:46 PM

      The questions that need to be first answered is whether you have any residual renal dysfunction in the solitary kidney, and do you have high blood pressure. If not, moderate consumption should not be a problem.

      Delete
  4. Kenneth L JohnsonApril 3, 2015 at 8:58 AM

    i ingest around 800mg of caffeine a day, I have been battling Angioedema lately, can that be linked to kidney damage from too much caffeine. I have been supplementing with ginger root and that seems to keep the angioedema and hives at bay... what are your thoughts on this?

    ReplyDelete
    Replies
    1. DrVCMay 23, 2015 at 3:16 PM

      Has your kidney function been objectively assessed? What is your GFR? Regardless of the cause, kidney damage will worsen edema in general.
      Angioedema however can also be from an allergic response, independent of kidney disease

      Delete
  5. UnknownJune 16, 2015 at 11:29 AM

    I have CKD Stage 3B and high BP which is controlled somewhat by meds. Will 3 to 4 cups of Joe a day do more damage to my kidneys?

    ReplyDelete
    Replies
    1. DrVCJune 22, 2015 at 12:47 PM

      We do not have good evidence that is does. As long as BP is well controlled

      Delete

Post a Comment

Popular posts from this blog

I do not want dialysis: how long can I expect to live, and how would I feel?

Image
I often see patients in my office who refuse dialysis (should it become necessary) for their advancing kidney disease. I divide these patients in to two categories. The more common category is patients who refuse it because of the "fear of dialysis". They could have trouble understanding dialysis and what potential benefits they could derive from it. They would often make good dialysis candidates who have more to lose than gain by refusing dialysis therapies. The other category is the patient who rightfully refuses dialysis because she or he would not make a good candidate for such treatment. There could be multiple reasons for that. It could be advanced age and frailty, presence of other severe disease conditions like heart failure or metastatic cancer, etc. In such cases, it is hard to always predict if dialysis would add anything to the quality/quantity of life. And often, patients are simply looking at the "big picture". So the questions that come up in
Read more

Is a vegan or vegetarian diet better for patients with kidney disease?

Image
Over the last few decades, we have seen the accumulation of evidence that supports the health benefits of plant-based diets. Vegetarian diets have been shown to be associated with a lower incidence of obesity, hypertension ,  diabetes , and coronary artery disease . Since all these entities are risk factors for chronic kidney disease (CKD), it might be reasonable to assume that these diets might actively reduce the risk of CKD development and progression. However, at the very outset, let me emphasize that any diet, vegetarian or not, comes with the same restrictions that are advised for patients with CKD . For instance, potassium intake might need to be restricted in advanced CKD. Fruits, a significant portion of the vegetarian diet, are an important source of potassium, and will need to be appropriately restricted. So you have to watch what you eat regardless. More importantly, you owe it to yourself to know what exactly is there in the food that you eat.
Read more