Can Eating Too Much Protein Hurt Your Kidneys?

High-protein diets seem to be everywhere these days. From keto and paleo to muscle-building meal plans, protein takes center stage. New nutritional guidelines in the United States even boosted protein intake recommendations.

But there’s a question worth asking with this trend: Is all that protein safe for your kidneys?

We asked nephrologist Juan Calle, MD, to explain how protein affects kidney health — and when it may become a problem.

How protein affects your kidneys

Your kidneys act as your body’s filtration system. They remove waste, extra acids and fluids from your system. Eating a lot of protein creates more work for your kidneys by increasing acids and waste products.

“While your body needs protein, too much puts more pressure on your kidneys to filter and process all of those substances,” explains Dr. Calle.

That extra workload matters, particularly as you age. Your kidneys naturally experience wear and tear over time. (They do a lot of work, after all!) Adding excessive protein can stress a tired system.

High-protein diets may also increase inflammation and oxidative stress in your body. That can make it harder for your kidneys — and the rest of your essential organs — to function at their best.

Guidelines on protein intake

So, how much protein should you try to consume every day? Recommendations in the U.S. changed in January 2026 to put a greater emphasis on daily protein intake.

The 2025-2030 Dietary Guidelines for Americans suggests that adults should eat 1.2 grams to 1.6 grams of protein per kilogram of body weight per day. That’s a 50% to 100% increase over the old standard of 0.8 grams (g).

If you weigh 150 pounds, the new guidelines translate to eating between 82g and 108g of protein per day. “That should be OK for most healthy people,” notes Dr. Calle.

But the stakes are higher if you have kidney disease. That’s a big group, too, as it’s estimated that more than 30 million Americans have kidney disease — with only about 10% knowing it. Many people don’t have symptoms until the disease is advanced.

“If you have kidney disease and eat that much protein, you’re putting more of a load on kidneys that are not working appropriately to begin with,” he adds. “So, you may want to stay at the lower end of those guidelines or even below them.”

Is more protein OK?

If your kidneys are healthy, an uptick in protein is usually fine — particularly if you’re an athlete in training with specific dietary needs. But going overboard can be risky.

“I usually suggest not going to an extreme,” states Dr. Calle. “If you start pounding a lot of protein, that may be an issue for your kidneys — even if you’re healthy. Finding a balance in your diet is probably the best recommendation.”

Talk to a healthcare provider or a registered dietitian for guidance.

What about protein powder?

Protein powder is a common sight on many athletes’ training tables, given its ability to fuel muscle growth. The supplement may also be recommended for people who are malnourished and need an extra boost.

In most other cases, there’s no need to add protein to your diet a scoop at a time.

“For the vast majority of people, protein powder isn’t necessary,” says Dr. Calle. “It’s not something that should be added to your diet without a definite reason. It can bring more consequences than benefits.”

Does the type of protein matter?

When it comes to putting demands on your kidneys, not all proteins are created equally.

Animal-based proteins (like meat products) tend to produce more acids for your kidneys to clear from your system, says Dr. Calle. That increases the workload and stress on your kidneys as they go about their job.

Plant-based proteins, on the other hand, tend to be easier for your body and kidneys to process.

If you’re using protein powder as a supplement, the same concepts apply. Powders made from plant-based ingredients will be easier on your kidneys than powders made from animal-based proteins.

Signs you’re eating too much protein

In its early stages, kidney disease often has no symptoms, so it’s not always easy to tell if you’re overtaxing those essential organs. Many people feel completely fine even as damage builds.

Typically, people only learn about kidney issues after abnormal results in a routine blood or urine test. But possible red flags could include:

• Swelling in your legs, particularly in the morning, or a rounder-looking face. “Both can be signs of fluid accumulating because of decreased kidney function,” says Dr. Calle.
• Sudden changes in your urination pattern, including how often you pee and the amount that flows out. (This could mean increases or decreases.) Foamy or bubbly urine can also be a sign of kidney damage.
• Fatigue from a growing toxin buildup in your system. “You become more lethargic,” says Dr. Calle. “Your energy just goes away.”

Given the difficulty in assessing kidney health, it’s best to talk with a healthcare professional before making significant changes to your protein intake. This is especially true if you have underlying health issues (like high blood pressure) or a family history of kidney disease.