5 Side effects of excessive calcium intake

Understanding the balance of nutrients in our diet is crucial for maintaining good health. Calcium, a key player in this balance, is essential for strong bones, muscle function, and nerve signaling. However, there’s a fine line between getting enough and having too much.

This blog highlights the less-discussed side of calcium consumption—the risks associated with its excessive intake. It’s a common belief that ‘more is better’ regarding nutrients. This mindset, however, does not always hold true, especially with minerals like calcium.

While deficiencies are a concern, an overload can be equally problematic. With various sources of calcium readily available, from dairy products to fortified foods and supplements, it’s easier than you might think to exceed the recommended daily intake.

What are the side effects of too much calcium?

Maintaining a healthy balance of nutrients is vital for our well-being, and calcium is a key component of this balance. It’s essential for strong bones, muscle function, and nerve signaling. But as with many things, too much can be harmful. 

Excessive calcium intake, often stemming from overuse of supplements or a very calcium-rich diet, can lead to several health issues. Let’s explore these side effects in detail [1].

1. Digestive issues

Excessive calcium intake can lead to several digestive issues, which are not only uncomfortable but can also disrupt your daily life. Here’s a closer look:

Constipation: This is a common side effect. High levels of calcium can slow down bowel movements, making stools hard and difficult to pass. This can be particularly troublesome if your diet lacks fiber or you’re not drinking enough water.

Bloating and gas: Bloating and gas are other signs that your body might be struggling with too much calcium. These symptoms often occur because an excess of calcium can interfere with the natural balance of the digestive system.

Risk of kidney stones: Perhaps the most serious concern is the increased risk of developing kidney stones. These stones form when high levels of minerals, like calcium, accumulate in the urine. They can cause significant pain and may require medical intervention.

If you’re experiencing any of these symptoms, your calcium intake might be worth examining, especially from supplements. Moderation is key, and a balanced diet usually provides enough calcium without excess supplementation.

digestive issues
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2. Cardiovascular risks

Navigating the impact of excessive calcium on heart health is crucial, as recent studies have raised concerns about potential cardiovascular risks. These include:

Plaque buildup in arteries: High calcium intake, especially from supplements, may contribute to the accumulation of plaque in your arteries [2]. This buildup can increase the risk of heart attacks by blocking blood flow or leading to the rupture of these plaques.

Blood pressure concerns: Although the relationship between calcium and blood pressure is complex, there’s growing scrutiny on how excessive calcium might influence blood pressure levels. It’s crucial to monitor and manage intake, especially if you have a history of heart-related issues.

Being mindful of these potential risks is essential. If you’re considering calcium supplements or consuming a lot of calcium-rich foods, it might be wise to discuss your diet and heart health with a healthcare professional.

3. Kidney function impairment

Excessive calcium intake can significantly impact kidney function, an aspect often overlooked. Here’s how it can affect your kidneys:

Kidney stones: A major concern is the formation of kidney stones. These painful deposits occur when calcium accumulates in the kidneys. High calcium levels in the urine are a key factor in the development of these stones, which can cause severe pain and may require medical treatment.

Impaired kidney function: Over time, excessive calcium can also strain the kidneys, potentially leading to chronic kidney issues. The kidneys play a crucial role in filtering and regulating minerals in the body, and an overload of calcium can disrupt this delicate balance.

It’s important to monitor your calcium intake if you have a history of kidney issues or are at risk of developing them. Regular check-ups and consultations with a healthcare provider can help manage your calcium levels, ensuring they stay within a healthy range and don’t burden your kidneys.

5. Bone health issues

When it comes to bone health, too much calcium can actually be a problem. Here’s what happens:

Increased risk of fractures: Contrary to popular belief, excessive calcium intake doesn’t always translate to stronger bones. It can increase the risk of fractures. This is because an imbalance of calcium can affect the bone remodeling process, where old bone is replaced by new bone, leading to weaker bone structures.

Interference with vitamin D absorption: Calcium works closely with Vitamin D in bone health. However, too much calcium can interfere with the body’s ability to absorb Vitamin D, a crucial nutrient for bone strength and overall health.

It’s vital to balance calcium consumption for optimal bone health. Simply put, more calcium doesn’t always mean stronger bones. Paying attention to your overall diet, including Vitamin D and other minerals, is key to maintaining healthy bones.

5. Cognitive impairments

Excessive calcium levels can surprisingly affect cognitive functions. Here’s what you should be aware of:

Confusion and fatigue: High calcium levels can disrupt normal brain function, leading to symptoms like confusion and fatigue. These symptoms can impact your daily activities and overall quality of life.

Potential long-term cognitive issues: Ongoing research explores the link between high calcium levels and cognitive decline. While this area is still under investigation, it highlights the importance of monitoring calcium intake to maintain overall brain health.

Considering these potential cognitive implications is important if you’re consuming high amounts of calcium, particularly from supplements.

Balancing your diet and consulting with healthcare professionals can help manage your calcium levels, ensuring they support your cognitive health as well as your physical well-being.

How do you prevent too much calcium in your body?

Understanding how to manage and prevent excessive calcium intake is crucial for maintaining your health [3].

Excessive calcium, often a result of overusing supplements or consuming too many calcium-rich foods, can lead to a range of health problems. Here’s a comprehensive guide to help you strike the right balance:

Know the right amount

Knowing the right amount of calcium for your body is the first step in managing your intake. 

The daily calcium requirement varies with age and gender. Adults typically need about 1,000 mg, which can go up to 1,200 mg for women over 50 and men over 70.

Factors like your overall health, diet, and lifestyle can influence how much calcium you need. For instance, if you’re lactose intolerant, you might rely more on supplements.

Pay attention to both the calcium you get from food and supplements. It’s easy to overlook how much you consume, especially if you eat a lot of dairy or take multivitamins.

Choose dietary sources over supplements
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Choose dietary sources over supplements

Choosing dietary sources over supplements for your calcium needs is often the healthier approach. 

Foods naturally rich in calcium often contain other essential nutrients that work in harmony with calcium for better absorption and utilization by the body [4].

It’s harder to consume too much calcium through food compared to supplements, which reduces the risk of potential side effects.

Dairy products are well-known calcium-rich foods but don’t forget about leafy greens, nuts, seeds, and certain fish. These offer added health benefits and variety to your diet.

Balance your diet

Balancing your diet is key to managing calcium intake effectively. Here’s how to do it:

  • Include a mix of fruits, vegetables, grains, proteins, and dairy in your meals. This ensures a well-rounded intake of nutrients, including calcium.
  • Pay attention to portion sizes, especially with calcium-rich foods. Moderation is crucial.
  • Whole foods are often better sources of nutrients than processed ones. They provide a more natural, balanced nutrient profile.
  • Some nutrients, like Vitamin D, enhance calcium absorption, while others, like iron, can compete with it. Plan meals to optimize nutrient absorption.

Consult with professionals

Consulting with healthcare professionals is a smart move when managing your calcium intake. 

Everyone’s health needs are unique. A healthcare provider can offer advice based on your specific health condition and dietary needs.

If you’re considering supplements, it’s crucial to get professional guidance to avoid excessive intake and potential interactions with medications.

Certain conditions can affect how your body processes calcium. Regular consultations ensure these conditions are managed effectively. Healthcare professionals have access to the latest research and can provide current recommendations.

In closing

Balance is the cornerstone of good health. Calcium, vital though it is, can have adverse effects when consumed in excess. The key lies in understanding your body’s needs, choosing the right sources of calcium, and keeping a balanced diet.

Taking charge of your calcium intake is an ongoing process. It requires attention and adjustments as your health needs change. By staying informed and proactive, you can enjoy the benefits of calcium without the risks associated with its excessive intake.


What happens if I consume too much calcium?

Consuming too much calcium can lead to kidney stones, constipation, and in severe cases, heart and brain function issues.

How much calcium do adults need daily?

Adults typically need 1,000 mg of calcium daily, increasing to 1,200 mg for women over 50 and men over 70.

What foods cause too much calcium?

Excessive consumption of dairy products, fortified foods, and calcium-rich supplements can cause too much calcium.

How do you know if your calcium is too high?

High calcium levels can cause symptoms like frequent urination, kidney stones, fatigue, and confusion.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6276611/
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7276095/
[3] https://www.betterhealth.vic.gov.au/health/healthyliving/calcium
[4] https://www.medicalnewstoday.com/articles/248958

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