Does a High-protein Diet Cause Severe Constipation? Dietitian Answers

Fitness enthusiasts are obsessing over high protein diets. While this diet has numerous benefits, from helping in building muscles to losing weight, it comes with some cons too. A high protein diet has the potential to cause kidney strain, digestive issues, and nutrient imbalances. Not just this, it is also believed to cause constipation. But how much truth is there in this belief? To understand whether a high protein diet can actually lead to constipation or not, read ahead.

Let us take a look at what Ms Chitra BK, Chief of Dietetics, KIMS Hospitals, Electronic City, Bengaluru, has to say about this.

Can a High-protein Diet Cause Severe Constipation?

Ms Chitra says that people often use high-protein diets for losing weight, gaining muscle, or improving their overall health. She adds, “However, some individuals experience constipation as a result of the increased protein intake. Although protein does not cause constipation as such, the way the diet is structured could result in digestive issues.”

The expert explains, “Most protein diets reduce the amount of food rich in carbohydrates like whole grains, fruits, veg, and legumes, which all contain dietary fibre. Fibre is responsible for stool volume and its smooth passability. Without sufficient amounts of fibre in the diet, stool may become hard. Low water intake could be another factor contributing to constipation; without enough water, excessive protein intake can worsen constipation.”

Tips To Avoid Constipation While on a High Protein Diet

On this note, Ms Chitra shares some tips to avoid constipation while following a high protein diet:

• Certain protein sources such as cheese or processed meat can worsen digestive health in some people. Therefore, it is safe to say that generally the intake of lean meat, eggs, dairy, lentils, and different vegetable proteins won’t lead to constipation as long as there is sufficient fibre intake.
• If you are trying to avoid constipation on a protein-rich diet, be sure to include different kinds of fruits and vegetables, whole grains, nuts, and seeds in your daily menu.
• Drink plenty of water every day.
• Exercise regularly. 

“If constipation persists for over 14 days accompanied by severe abdominal cramps, bleeding, or unexplained weight loss, do not hesitate to contact your healthcare provider,” warns the expert.

“It is also important to keep in mind that in order to be able to keep up a healthy lifestyle, one needs to follow a balanced and protein-rich diet that will supply enough fibre and fluid for a person’s body,” concludes Ms Chitra.

What Study Says About Protein’s Link To Constipation

A 2024 study, published in the peer-reviewed medical journal Neurogastroenterology & Motility, attempted to understand whether there is a direct connection between the amount of protein people eat and whether they experience constipation. The researchers examined dietary habits and digestion data from nearly 14,000 adults. All of them participated in a large national health survey. They analysed constipation in two distinct ways: defining it by either how often a person used the bathroom or the actual physical consistency of their stool. 

The findings noted that simply eating more dietary protein did not increase the overall risk of developing constipation. It added that for an average healthy person, an increase in protein intake showed no significant negative effect on either the frequency of bowel movements or the firmness of the stool. However, the researchers emphasised on the fact that a person's overall diet played an important role in how protein impacted their daily digestion. 

The study stated that for individuals who ate a diet very low in carbohydrates, consuming more protein was linked to a higher chance of constipation. On the other hand, those who consumed a moderate amount of carbs and increased their protein intake actually slightly lowered their risk of these digestive issues. 

Therefore, the research clearly suggests that protein itself is not the primary root cause of constipation. Rather, it's the overall balance of other essential nutrients that matters most. Moreover, maintaining a well-rounded diet with adequate carbs is the most effective way to prevent constipation while on a high protein diet. 

ALSO READ- Too Much Protein, Too Little Fibre? Expert Explains Why This May Harm Your Gut Health

Conclusion

To conclude, both expert advice and scientific research confirms that a high-protein diet does not inherently cause severe constipation. In fact, the main culprit behind this digestive discomfort is the lack of dietary fibre and adequate hydration. When these are accompanied by low-carbohydrate, protein-heavy meals, it may cause constipation. 

To enjoy the health benefits of extra protein without harming your digestion, it is important to maintain a balanced intake of fibre-rich whole grains, fruits, and vegetables. It is also crucial to pair this proper nutrient balance with plenty of daily water and regular physical activity. All these can help keep your bowel movements smooth and regular. However, if severe constipation and abdominal pain persists despite making healthy lifestyle changes, it is best to consult a healthcare professional.