The benefits of protein: 6 common myths
The benefits of protein intake still spark debate in the gym: one person says you need protein for your muscles, while another worries about their kidneys and liver. In reality, the picture becomes simpler when you distinguish between a healthy person who trains and someone who already has a medical condition or restrictions set by their doctor.
Why are the benefits of protein controversial in the first place?
When you start exercising more, protein soon comes up in conversation. Your muscles need building blocks for recovery, yet claims persist that a higher protein intake damages your kidneys, makes your bones brittle or raises your blood pressure.
Honestly, that concern is understandable. When everyone is talking about supplement tubs, chicken breast and quark, protein can start to sound like something inherently risky. In reality, we are mostly talking about ordinary protein-rich foods and how your body uses them.
The key distinction here is your health. If you already have problems with your kidneys, liver, heart or circulation, you need to discuss your intake with your doctor. If you are healthy and train, the available evidence does not support the idea that eating moderately more protein-rich food is inherently dangerous.
The benefits of protein and your kidneys
The first myth concerns your kidneys. A common claim is that a high protein intake puts a strain on your kidneys because breaking down protein produces ammonia. Ammonia is indeed toxic to the body, but a healthy body can process and excrete it.
According to the original article, no cases have been found in which healthy kidneys were damaged solely by a higher protein intake. One broader review even noted that protein intake does not impair kidney function in a healthy person and that there is no reason to restrict it without cause.
Higher intakes have also been studied in trained individuals. An example cited in the article states that even 2.8g of protein per kilogram of body weight showed no negative effects. In that context, the recommended daily protein intake of 0.8 g per kilogram of body weight sounds more like a modest starting point than a threshold for harm.
The simple truth is that a healthy kidney is not the same as a diseased kidney. If your test results are normal and you feel well, there is no reason to avoid protein solely because of scare stories.
How does protein affect your bones and acid-base balance?
The second common concern is bone health. It was once thought that a higher protein intake leached calcium from bones and increased the risk of osteoporosis. The newer explanation is more nuanced: increased calcium excretion may reflect better absorption in the gut, rather than calcium loss from bones.
According to the study cited in the original text, increasing protein intake from 0.7 grams to 2.1 grams per kilogram of body weight per day increased calcium absorption from 18.4% to 26.3%. This does not indicate bone breakdown; instead, it suggests that the body is processing minerals more actively.
There was another important detail: a low protein intake, such as 0.7g per kilogram of body weight, was associated with lower blood calcium levels, while the release of parathyroid hormone, or PTH, increased to 1.6-2.7 times the normal level. A protein intake of 1g per kilogram of body weight per day was considered normal.
The third issue is acid-base balance. A higher protein intake can shift this balance toward acidity. What helps? There is no need to panic: add more fruit and vegetables to your plate. They provide potassium, which helps counteract acidity.
How does protein affect your heart, blood pressure and liver?
An old claim about blood pressure also persists: a higher protein intake means higher blood pressure. The original article says the opposite. It notes that higher protein levels in the body may be associated with lower blood pressure, particularly in people whose blood pressure rises with excessive salt intake.
When it comes to cardiovascular health, the conversation often turns to fatty meat. Among protein-rich foods, the article singles out meat, with fat accounting for around 28% of its total calories. This does not mean that every cut of meat is bad for you, but that you need to consider your overall diet and how much you move.
Saturated fat may pose a greater risk if you are sedentary. If you are healthy and physically active, the picture is different: the studies cited in the article described better blood lipid profiles. Protein from oily fish is also valuable because the fish provides omega-3 fatty acids.
Another interesting point is that increasing the proportion of protein in your diet at the expense of carbohydrates may lower total blood cholesterol and so-called bad cholesterol, while raising good cholesterol. This is not a license to eat carelessly, but it does put the scare stories into perspective.
As for the liver, the American Heart Association stated that excessive protein intake affects liver function. The original article emphasizes that no firm scientific evidence was found to support this. On the contrary, protein helps transport lipotropic substances, such as methionine and choline, which prevent fat from accumulating in the liver.
The benefits of protein: practical choices
In practice, there’s no need to overcomplicate protein. Start with everyday foods: fish, meat, eggs, dairy products, legumes and other protein-rich options. If you train hard, pay attention to your recovery, sleep and digestion. These often tell you more than a single number on paper.
If you want to increase your intake, do it gradually. Add protein to your meals rather than building your entire diet around it. Keep fruit and vegetables in your diet, as they support acid-base balance and make your meals enjoyable to eat.
If you have been diagnosed with kidney, liver or heart disease, it’s a different story. In that case, advice from a gym buddy isn’t enough. Ask your doctor or a nutrition counselor how much protein is appropriate for your particular condition.
FAQ
Does a higher protein intake damage your kidneys?
If your kidneys are healthy, the data described in the original article do not show that a higher protein intake damages them. If you have an existing kidney condition, you need to discuss your intake with your doctor.
Can protein weaken your bones?
The longstanding concern was that protein draws calcium out of your bones. The examples in the article instead suggest better calcium absorption, especially when your diet also includes enough plant foods.
Do the benefits of protein mean that more is always better?
No. Protein is essential, but your diet needs to stay balanced. Consider your training load, body weight, health and how your body actually handles a higher intake.
Author: Body – translated by Rosin
Source: WHO – physical activity.
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