Consuming multiple cups of coffee a day is likely to be safe for the kidneys in the general population, and is associated with an increase in estimated glomerular filtration rate (eGFR), according to findings of a study from the Netherlands.
Conclusions: Coffee consumption was associated with a slightly higher eGFR, particularly in those aged ≥46 y. The absence of an association with eGFR changes suggests that the higher eGFR among coffee consumers is unlikely to be a result of glomerular hyperfiltration.
Hence, caffeine increases glomerular filtration rate by opposing the vasoconstriction of renal afferent arteriole mediated by adenosine via type 1 AR during the tubuloglomerular feedback. Caffeine also inhibits Na(+) reabsorption at the level of renal proximal tubules.
In this population-based study, we examined factors associated with glomerular filtration rates (GFR) in both genders. The findings of our study showed that obesity, diabetes, blood urea nitrogen, atherogenic factor, hypertension, meat consumption, and smoking were associated with lower GFR.
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.
“Coffee is one of the most consumed beverages worldwide and is generally considered safe for CKD patients, although a number of caveats may limit its consumption (potassium contents, phosphate from milk or additives, amount of fluid, acute pressor effect),” Mehmet Kanbay, MD, and colleagues wrote.
A decrease or decline in the GFR implies progression of underlying kidney disease or the occurrence of a superimposed insult to the kidneys. This is most commonly due to problems such as dehydration and volume loss.
The estimated glomerular filtration rate (eGFR) is variable and it relies on a blood test, which may have day to day variations and it is an "estimation". Hence, the more times you do the test, the more accurate will be the estimate. It can depend on some food that you eat.
If the decrease in the estimated glomerular filtration rate (eGFR) is due to acute kidney injury with a sudden decrease in kidney function, this can commonly be reversed. If the kidney disease is due to chronic kidney disease (CKD), the recovery of eGFR is usually not possible.
An increase in renal arterial pressure (or renal blood flow) causes an increase in GFR. A reduction in renal arterial pressure (or renal blood flow) will have the opposite effect (1).
Avoid processed foods and choose fresh fruits and vegetables instead. Follow a low-salt diet. Salt should be limited especially if you have high blood pressure, protein in your urine, or swelling, or difficulty breathing. Eating less than 2000 mg a day of sodium is recommended.
Don't eat ham, bacon, sausage, hot dogs, lunch meats, chicken tenders or nuggets, or regular canned soup. Only eat reduced-sodium soups that don't have potassium chloride as an ingredient (check the food label.) Also, only eat 1 cup, not the whole can.
The impact of independent variable of fasting, using linear regression was found to be statistically significant (ppost-<0.001). The eGFR was 14.826 points higher in those who fasted after Ramadan than in those who did not.
gFR declines with age, even in people without kidney disease. If your GFR is between 60 and 89... People with mildly low gFR (between 60 and 89) may not have kidney disease if there is no sign of kidney damage, such as protein in their urine.
However, we know that GFR physiologically decreases with age, and in adults older than 70 years, values below 60 mL/min/1.73 m2 could be considered normal.
GFR generally declines at a rate of 1 mL/min/year. However, patients who lose renal function faster than the average age-related decline in GFR tend to progress to ESRD. Krolewski et al. defined progressive renal decline as an eGFR loss of ⩾3.3% per year.
GFR is most sensitive to hydrostatic pressure changes within the glomerulus. A notable body-wide example is blood volume. Due to Starling's law of the heart, increased blood volume will increase blood pressure throughout the body.
Conclusions: In fasting adults, high hydration lowered GFR and increased natriuresis. After a meat meal, GFR increased only in the high hydration regimen and natriuresis only in the low hydration regimen. Hydration affects GFR and natriuresis under fasting conditions and after a meat meal.
Hence, Chronic Kidney Disease patients should consider limiting coffee intake to eight (8) ounces and tea to just sixteen (16) fluid ounces. Aside from the daily intake recommendations, there is not much of a difference between the two commonly consumed drinks.
While plain water is the best drink for your kidneys, other fluids are perfectly acceptable, including coffee, green tea, low-potassium juices, and infused water. Avoid sweetened, carbonated beverages and coconut water.
Researchers have investigated the effects of coffee intake on acute kidney injury risk. They found that drinking any amount of coffee reduces the risk of acute kidney injury but that 2-3 cups per day is most beneficial.