How can you tell if you're eating too much protein? 

Proteins are essential macronutrients that the body needs. They are found infoodssuch as milk, meat, eggs, and fish (and other protein sources), and can also be obtained throughsupplements. 

In fact, numerous scientific studies have shown that consuming an adequate amount of protein improves the body’s adaptive response to exercise. But howcan you tell if you’re eating too much protein? In sports nutrition, the recommended intake ranges from 1.4 to 2.0 grams per kilogram of body weight per day, depending on the type and intensity of exercise. Beyond that, is there a health risk? 

Fromsigns of overconsumption towatch out for (dehydration, ammonia in the urine, digestive issues, etc.) to practices to avoid, here’s what you need to know about how much protein to consume, whether you’re working out or not. 

How much protein do you really need?

Official recommendations or actual needs

Protein requirementsvary¹. They depend on:

• theconsumer'sage;
• bodycomposition;
• totalenergy intake; 
• its transaction volume;
• his fitnesslevel.

In other words, it’s impossible to give a single, precise figure. That said, there arecalculators that estimate protein intakebased on individual profiles, as well as general guidelines and ranges: 

• The Recommended Daily Intake (RDI) is0.83 g/kg/day forthe general adult population. This represents the minimum amount required for good health for a person who does not engage in any particular physical activity; 
• The minimum amount recommended by the ISSN for athletes is1.4 to 2.0 g/kg/day¹;
• Higher doses are required for older adults¹ with the same level of physical activity, with a minimum intake that is approximately20 to 30% higher.

Exercise intensityalso affects energy requirements, as shown in the table below, which is based on data from a 2016 study²:

Amount of protein needed to meet the body's functional needs	Intensity level of the exercise performed
1.0 g/kg/day	minimal physical activity
1.3 g/kg/day	moderate physical activity
1.6 g/kg/day	intense physical activity

At what point can we say there is an excess of protein?

Consuming more than 2 to 2.2 g/kg/day does not provide any additional benefit, contrary to the common belief thatthe more protein you consume, the more muscle you gain. 

We speak of a relative excess—exceeding one’s personal needs—or an absolute excess if protein levels become too high. In this regard, the French Agency for Food Safety (AFSSA) cites arisk ofliversaturationat intakes exceeding 3.5 g/kg/day³, which is significantly higher than any recommendations found in the literature. In this case, the anabolic pathway is saturated, and the excess amino acids are not utilized for protein synthesis. 

When it comes to excesses, we can also distinguish betweenoccasional and chronicoverindulgence, which have different effects. 

How can you tell if you're eating too much protein? 

To determine whether you're consuming too much protein, you first need to be able to count it.

Keep track of your protein intake

Whether with the help of a nutritionist or on your own, you can calculate your protein intake based on your diet. For each meal of the day, simply look at the amount of protein in each food item. 

To achieve this, the process is inevitably a bit tedious. First, you list all the foods you eat to weigh or estimate their protein content. Adding them all up will give you the total daily amount. 

Let’s take the example of a 45-year-old man weighing 75 kg whose goal is to gain muscle mass. 
According toour calculator, the recommendations range from 1.6 to 2.2 g/kg/day, or 120 g to 165 g of protein. Theoretically, he should therefore consume an averageof 143 g of protein per day(1.9 g/kg/day) spread across 3 to 5 meals. 

Here is a relatively standard sample meal plan for someone looking to gain weight:

Meals	Food	Serving size	Average protein content*	Total protein
Breakfast	2 eggs + cottage cheese + rolled oats	120 g 150 g 30 g	12.0 g 10.5 g 3.4 g	about 25.9 grams
Lunch	Grilled chicken breast + rice + vegetables	150 g 150 g 200 g	45.0 g 4.9 g 3.3 g	about 53.2 grams
Snack	1 serving of mass gainer with roasted almonds	100 g 30 g	23.0 g 6.0 g	about 29.0 grams
Dinner	salmon vegetables 1 scoop ofwhey	120 g 200 g 30 g	27.6 g 3.3 g 23.0 g	about 53.9 grams
Total				162.0 g of protein

*based on the ANSESCiqal table

Is this person eating too much protein? On this day,protein intake reached162.0 g, which is 2.16 g/kg/day for a person weighing 75 kg. So, in theory, this isn’t too much, but it’s at the very top of the recommended range. 

On the other hand, if this man only works out once a week, or is simply looking to maintain his ideal weight, then this intake is significantly higherthan necessary.

This example shows that it is possible to exceed the recommendations and that the concept of excess depends largely on the athletic context of the individual. 

The physiological signs of excess

Chronically consuming more protein than the body needs can affect its ability todetoxify ammonia⁴. Among the adverse effects highlighted by INSERM are: 

• intestinaldiscomfort;
• digestive problems (such as constipation if fiber intake is low); 
• hyperammonemia, which is an increase in blood ammonia levels that can affect breath odor;
• hyperinsulinemia or elevated insulin levels;
• fatigue;
• headaches;
• liver and kidney damage. 

Is it dangerous to consume too much protein?

According to science, there isno riskassociated with consuming more than 2.0 to 2.2 g/kg/day of protein over the long term if you are in good health². But there is no benefit to it either. 

Protein does not damage the kidneys. However, if a person has an existing kidney condition, a doctor may sometimes recommend limiting protein intake, which is why it is important to consult a healthcare professional. For these individuals, INSERM recommends limiting protein intake to no more than 0.8 grams per kilogram of body weight per day⁴.  

The upper tolerable limit for the body is3.5 g per kilogram of body weight per day in healthy individuals. However, a chronically high protein intake—more than 2.0 g per kg of body weight per day—can lead to digestive issues, as well as kidney or vascular problems². At Protéalpes, we generally recommend, as a conservative measure, simply avoiding intake levels above 2.0 g/kg/day.

The Real Risks Associated with Excess Protein

The effect on muscle synthesis

Muscleproteinstores are notinfinite. Beyond the amount the body can process, consuming too much protein is pointless.

The optimal intake per serving is the amount that maximizes protein synthesis. Scientific data indicates that this intake depends on age, but also on the type of exercise performed. The guideline isapproximately 25 g ofhigh-qualityproteinper serving for an adult.

If you exceed this amount—and the higher the dose—amino acids begin to oxidize. As a result, this is likely to cause more side effects than benefits, such as bad breath, for example, and digestive discomfort. 

Nutritional imbalance

Excess protein can indirectly impair performance. When you eat too much protein, you risk consuming fewer other nutrients.

Fewer carbohydratescan affect performance, particularly during endurance activities or intense exercise. 
Similarly, with fewer essentialfats, the impact is felt at the hormonal level.
Finally, lessfiberwill disrupt the gut microbiota and digestion. 

Each macronutrient group plays a vital role in athletic performance. That’s why we always recommend abalancedand varieddiet, including fats, grains, vegetables, meat, and fish… And, of course, we mustn’t forget about hydration, which is a key factor in performance, especially given the harmful effects of dehydration. 

Protein Marketing

The industry has successfully led people to believe that more protein leads to more muscle, thanks tohigh-protein products. From protein shakes, bars, skyr, cottage cheese, pancakes, pasta, and cookies, protein-rich foods are flooding the market. 

The problem is that someone who relies on these products can quickly end up consuming too much protein. With 150 to 180 g/day—a level that can be reached fairly quickly—this amounts to 2.3 to 2.8 g/kg/day for a 65-kilogram man or woman, for example. Becauseeverything is fortified, this exceeds the recommended intake and bears no relation to their actual needs.

How can you manage your protein intake?

Adjust to your actual goal

Before increasing yourprotein intake with ahigh-protein diet, you should ask yourself why you want to eat more of it. Your needs will varydepending on your athletic goals:

• build muscle; 
• lose fat; 
• maintain one's overall health;
• Aging Well for Seniors. 

Eating too much protein isn't necessarily better. What matters is adjusting your protein intake to your specific circumstances.

Redistribute rather than increase

Muscle protein synthesispeaks aftereach meal. Our standard, science-based recommendations are therefore to aim for: 

• 20 to 30 g perserving; 
• 3 to 5 servings spread outthroughout the day;
• 2 to 3 g of leucineper serving. 

This strategy helps you avoid consuming most of your daily caloric intake in a single meal. 

Balancing quality and quantity

The quantity andquality of proteinsare key factors in their nutritional value².

In addition toleucine content, we also consider thedigestibility andbiological valueof the protein consumed. In this regard, theessential amino acid (EAA) profile is a key criterion. 

Vary your sources of protein

Are some proteins healthier to eat than others? Actually, there’s nosuch thing as “good” or “bad” protein. 

Animalsources are often more digestible and provide a complete profile of essential amino acids.
Plant sources can also be beneficial, provided that different sources are combined, such as a mix of legumes and grains.

A variety of protein sources improves overall nutritional balance and provides more micronutrients. It also helps avoid another problem: dietary monotony. 

Conclusion

The ideal diet isn’t about consuming more protein, but rather about ensuring adequate, well-distributed, and high-quality protein intake. Like any other nutrient, protein intake must be tailored toactual needs, taking into accountphysical activity level,body weight, andathletic goals. 

Proteins are a family of macronutrients essential for the body’s proper functioning. Their role is to contribute tomuscle synthesisand the maintenance of lean body mass. For a healthy, active individual, consuming between1.4 and 2.0 gramsper kilogram of body weight per day poses no risk to kidney function. However, exceeding 2.2 g/kg/day offers, at best, no additional benefit, and at worst, associated side effects. There is a threshold beyond which muscle protein synthesis is saturated. It is therefore no longer possible to utilize more protein or create unlimited storage.

When there is anexcess of protein, the diet can become unbalanced. Fewer carbohydrates, fats, and fiber lead to amoregeneralnutritional imbalance. However, overconsumption can happen quickly due to fortified or concentrated products. Shakes, protein bars, cottage cheese… when added to traditional sources like meat, fish, or eggs, these foods can rapidly increase daily intake. 

In practice, to avoid excessive protein intake, you should first adjust your intake to match your goal (muscle gain, maintenance, weight loss, or health). Next, spread this intake across 3 to 5 meals and snacks rather than consuming it all at once. Then, focus on high-quality protein sources and dietary diversity. Finally,follow the recommendationsbased on your level of physical activity and your health status.

Eating protein is an essentialpart of a healthy diet. Rather than consuming too much protein, the goal is to maintain adiet consistentwith your needs, training regimen, and overall balance, so that it is both effective and healthy for your body.