8 Foods that Actually Damage Your Kidneys

4. Caffeine
So many of us need a daily hit of caffeine to really get going in the morning, plus an evening dose or two when we have to work late. But because caffeine is a stimulant, it accelerates blood flow and can increase blood pressure. It is also a mild diuretic, which means that it affects the kidney’s ability to absorb water and can lead to dehydration.

In small amounts, caffeine does not put too much stress on your kidneys. Overconsumption, however, may worsen kidney disease and cause kidney stones due to chronic dehydration. As long as you stick to 2 or 3 caffeine beverages per day and drink plenty of water in the interim, you shouldn’t need to worry. Just make sure to get your fix from coffee or tea rather than sodas or energy drinks. We’ll talk more about that next.