Worker A often eats protein bars to easily fulfill meals and increase muscle mass. However, if replacing meals with protein bars becomes frequent, protein intake can become excessive. Prolonged this way, it may lead to various health issues.

Excessive protein intake causes constipation. 

Ammonia produced from the breakdown of proteins is converted into urea in the liver and excreted through urine. Eating more protein increases the amount that needs to be excreted in urine, which in turn draws water that could be used elsewhere.

Constipation can occur if water is drawn from the large intestine at this time.

Proteins tend to reduce the intake of dietary fiber, which helps alleviate constipation, because they also contribute to a feeling of fullness.

People with kidney problems should also be careful.

Proteins contain nitrogen components, so excessive intake of protein results in the production of a large amount of nitrogen waste during protein breakdown. This puts a burden on the kidneys, which filter waste from the body. If this state persists for a long time, there is a higher risk of developing kidney disease and decreased function. When the kidneys cannot perform their functions properly, nitrogen compounds, organic acids, phosphates, and other substances produced during protein metabolism are not excreted smoothly. They accumulate in the body, increasing the risk of cardiovascular diseases. Uremia, a condition caused by the inability to excrete waste products, can also occur.

Eating too much protein increases the risk of developing gout. 

Gout is a disease in which uric acid, the final metabolic waste product, is not properly excreted and accumulates as crystals in the cartilage, tendons, and surrounding tissues of the joints. High-protein foods contain a lot of purines (a type of nitrogen compound), and the uric acid produced from the breakdown of purines is the cause of gout. When protein intake increases, uric acid accumulates in the joints, and the immune system mistakenly identifies the uric acid crystals as foreign invaders and attacks them, causing pain.

Meanwhile, the appropriate daily protein intake is 0.8 to 1 gram per kilogram of body weight. For those training their muscles or elderly with low muscle mass, this can be increased to approximately 1.2 grams per kilogram of body weight depending on their health condition. To prevent diseases caused by excessive protein intake, the amount of protein consumed through protein bars should be adjusted to match the recommended intake.

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I've heard that eating a lot of meat can cause indigestion.

Since it's a protein bar, it applies here..

I didn't know constipation could also occur..

Are there any people who bring a protein bar in the morning?

Please refer to this.