Can You Eat Too Much Protein?

Walk through the grocery store these days, and it seems like protein is everywhere. Protein cereal. Protein pancakes. Protein bars. Even protein chips. It all fits into the “protein maxxing” eating trend.

But while protein is an important part of any diet, eating more isn’t always necessary or healthy. You can get too much of a good thing.

So, how do you know what’s right for you when it comes to protein?

“It starts with understanding your body’s true protein needs,” says registered dietitian Julia Zumpano, RD, LD. “Some people do need more — but that’s not the case for everyone.”

How much protein is too much?

The 2025-2030 Dietary Guidelines for Americans recommends that adults aim to eat 1.2 to 1.6 grams of protein per kilogram of body weight per day. (If you’re not a metric system fan, a similar formula is 0.5 to 0.75 grams of protein per pound of body weight per day.)

For a typical 150-pound (68-kilogram) person, that means eating roughly 80 to 110 grams of protein per day.

“This puts you in the ballpark of what you should aim to consume,” says Zumpano.

From there, factors like your activity level and age help determine if you need more protein. Workout warriors who exercise regularly and intensely, for example, likely need more daily protein. Ditto for older adults, especially after age 65.

If you’re a physically active person, long-standing studies and health experts say that up to 2 grams of protein per kilogram of body weight is safe. (That’s roughly equal to 0.9 grams of protein per pound of body weight.)

But that still doesn’t mean you should try to pack in as much protein as possible when you sit down for a meal. The reason? Research suggests that 25 to 35 grams of protein per meal is the maximum amount our bodies can use at one time for muscle building.

“Consuming protein beyond that in one sitting won’t harm you, but it’s unlikely to increase muscle protein synthesis,” says Zumpano. “Instead, spreading protein intake evenly throughout your day is most beneficial for maximizing muscle growth and repair.”

Side effects of protein maxxing

Regularly eating too much protein can come with health risks, especially if most of it comes from animal-based foods or nutritional supplements. Zumpano shares that some of the main concerns include:

• Kidney strain: Your kidneys help clear out the waste that’s made when your body breaks down protein. If you consistently take in more protein than your body needs, it can stress or even damage your kidneys.
• Kidney stones: Diets that are very high in animal protein may make kidney stones more likely for some people. (And trust us: Nobody wants to experience kidney stones.)
• Nutrient deficiencies: Focusing on protein shakes, meat or other high-protein foods can push plant-based foods off your plate. In that situation, you may end up getting less fiber, vitamins and other nutrients your body needs.
• Heart health: A high-protein diet can be a concern if a lot of that protein is coming from red meat or processed meats with high amounts of saturated fat, which brings increased risk of heart disease.

Signs you’re eating too much protein

If you’re overdoing it on protein, your body may let you know, says Zumpano. Signs that a high-protein diet is getting too high can include:

• Digestive issues: High-protein diets can contribute to constipation, especially if protein-rich foods are replacing fiber-rich foods like fruits, vegetables, legumes and whole grains.
• Dehydration: Processing large amounts of protein can lead to dehydration. That’s because your body pees out more water to help get rid of the waste from breaking down all that protein.
• Bad breath: Very high-protein diets — especially those that are also very low in carbohydrates — can sometimes cause unpleasant breath. This side effect is often called “keto breath.” (It can be a byproduct of following the keto diet.)
• Weight gain or stalled weight loss: Protein contains calories, too — about 4 calories per gram. If extra protein pushes your total calorie intake above your needs, it can lead to weight gain or make weight loss harder.

How to keep your protein intake in check

Protein maxxing doesn’t need to become a numbers game where the highest total wins.

Instead, Zumpano recommends figuring out what you need and building a balanced diet around that target.

These strategies can help:

• Calculate your needs. As a starting point, Zumpano advises multiplying your weight in pounds by 0.5 to 0.75 to estimate a general range of grams of protein per day. Adjust from there based on factors like age and exercise routines.
• Know your protein intake. Track a typical day before deciding you need more protein. “If you’re meeting your needs, maybe rethink adding more,” she says. If you’re short on protein, try eating more whole-food sources of lean protein before just using protein shakes and similar protein supplements.
• Spread protein throughout the day. Rather than eating most of your protein at dinner, as many people do, aim to include some at each meal. Balance your day by adding protein to breakfast and lunch.
• Don’t forget plant-based protein. Beans, nuts, seeds and other plant-based foods can increase protein intake while supplying fiber and other nutrients not found in animal products. Plus, eating more plant-based protein can reduce your risk of chronic diseases like diabetes, heart disease and obesity.
• Be selective about protein-enhanced foods. You probably don’t need to add protein to everything you eat simply because it’s available. Focus more on getting your protein through whole foods.
• Use protein powders purposefully. Protein powder can be a convenient option if you need to boost protein intake to meet your needs, but don’t just add it to push numbers higher.
• Maintain a balanced diet. Don’t let a focus on protein squeeze everything else off your plate. A varied diet provides fiber, vitamins, minerals, antioxidants and other nutrients that protein alone can’t deliver.

The bottom line? Remember that while protein is important to your diet, there’s no prize for pushing your intake numbers higher through protein maxxing. Be satisfied with hitting your specific protein target.

“You want to make sure to get enough protein,” states Zumpano. “But know your limit.”