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How much coffee is too much for kidneys?

Research has not shown that drinking 3-4 cups of coffee a day increases the risk of kidney disease or increases rate of decline of kidney function. However, moderating how much coffee you drink is a good idea. Those struggling with blood pressure control should especially drink less than three cups per day.

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By Jessianna Saville, Renal Dietitian

Coffee is staple for more than 5 out of 10 Americans who drink it daily1. When people find out they have kidney disease and must make dietary changes, one of the first questions they ask is, “Do I need to give up my coffee?” The bottom-line answer is “No.” Coffee is not bad for coffee-lovers with kidney disease2, but here are a few things to think about:

The Amount of Coffee You Drink

First thing to consider is the nutritional content of coffee. An 8 oz. cup of black coffee has 116 mg of potassium3. This is considered a low potassium food. However, many people drink more than one cup of coffee each day. Three to four cups of coffee a day is considered high in potassium and could raise your potassium levels. Adding creamers or milk can further raise your coffee’s potassium content. Drinking less than three cups of coffee/day is generally considered safe. Phosphorus, sodium, calories, carbohydrates and protein are minimal in black coffee and not of nutritional consideration. How is your kidney health? Use our online curriculum to get individualized information for your stage of kidney disease. Enter Kidney Pathways

Your Blood Pressure

Caffeine causes a short but sudden increase in blood pressure . Research has not shown that drinking 3-4 cups of coffee a day increases the risk of kidney disease or increases rate of decline of kidney function. However, moderating how much coffee you drink is a good idea. Those struggling with blood pressure control should especially drink less than three cups per day. What is added to coffee can often be more of a problem than the coffee itself. For example, an 8 oz. cup of cafe latte, made without flavored syrup, rolls in at 183 mg of phosphorus and a whopping 328 mg of potassium (4). Creamers can also be a problem. Manufacturers add chemical phosphates to coffee creamers. These chemical phosphates are easily absorbed by the body and should be limited for anyone with kidney disease.

Your Fluid Intake

Coffee counts as fluid. If you are on a restricted fluid diet , you should include drinking coffee in your daily allowance. In summary, coffee is an acceptable beverage for kidney disease. If consumed in moderation it poses little risk for those with kidney disease. Additives to coffee such as milk and many creamers increase the potassium and phosphorus content of coffee. Individuals with questions about their coffee intake should talk to a registered dietitian or physician about how much is appropriate for them. Jessianna Saville, MS, RDN, LD, CSR, CLT is a board certified renal nutrition specialist and registered dietitian licensed in the state of Texas. She has worked in outpatient dialysis since 2009. She currently blogs about renal nutrition at www.KidneyGrub.com where she loves to showcase beautiful, renal-friendly food. She feels passionately about the role nutrition therapy plays in kidney disease to improve quality-of-life, reduce hospitalization, and slow progression to dialysis. In her spare time she enjoys running, exploring new places with her husband and two children, and trying to make her garden grow.

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Do drinks like tea and coffee count towards daily water intake?

Coffee and tea also count in your tally. Many used to believe that they were dehydrating, but that myth has been debunked. The diuretic effect does not offset hydration.

Water doesn't get the same media attention as green tea, antioxidants, and the latest fad diets. Yet it plays a much more critical part in our daily lives and our bodies. Our bodies are made up of about 60% water, and every system depends on water. So water is important for healthy skin, hair, and nails, as well as controlling body temperature, heart rate, and blood pressure. "It's definitely essential," says Jim White, registered dietitian and personal trainer in Virginia Beach, Va., and American Dietetic Association spokesman. "What we're finding is so many people are deficient," he notes. "We're seeing a huge decrease in athletic performance and fatigue that's caused by the lack of hydration." You can stay fully hydrated throughout the day by drinking water and other fluids, as well as eating foods that are hydrating.

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