Calcium

What is Calcium?

Calcium is the body's most common mineral and constitutes a fundamental building block for our health. Approximately 99% of the calcium in the body is found in the bones and teeth, where it provides structure and strength. It plays a crucial role in several physiological processes, including bone health, muscle contraction, and nerve impulses. Without sufficient calcium, the body cannot function optimally, making this mineral an important part of a balanced diet.

How does it work in the body?

Calcium has many important functions in the body. Besides building and maintaining the skeleton, calcium is necessary for:

• Muscle contraction: Calcium helps muscles contract, which is essential for physical movement.
• Nerve impulses: It is involved in the transmission of nerve signals, allowing the brain to communicate with the rest of the body.
• Blood coagulation: Calcium plays an important role in the blood clotting process, which is necessary to stop bleeding.
• Hormonal signalling: It also participates in the release of certain hormones and enzymes important for various metabolic processes.

Scientific benefits

Research has shown that calcium is vital for maintaining bone health and preventing osteoporosis, especially in older adults. A study published in The Journal of Clinical Endocrinology & Metabolism demonstrated that adequate calcium intake can reduce the risk of fractures in postmenopausal women. Additionally, research points to calcium's role in regulating blood pressure and reducing the risk of cardiovascular diseases. A meta-analysis published in the American Journal of Clinical Nutrition found an association between higher calcium intake and lower blood pressure.

Dosage and recommendations

The recommended daily dose of calcium varies depending on age and sex. According to the Swedish National Food Agency, adults should aim to consume 800 mg of calcium per day. For teenagers and pregnant women, the requirement may be higher, up to 1300 mg per day. It is important to obtain calcium primarily from natural sources, but supplements may be necessary for those who have difficulty reaching their daily intake through diet.

Best sources and forms

Calcium is found in many foods, and some of the best sources include:

• Dairy products: Milk, cheese, and yoghurt are rich in calcium.
• Vegetables: Dark green leafy vegetables such as spinach, kale, and broccoli also contain calcium.
• Nuts and seeds: Almonds and chia seeds are good plant-based sources.
• Fortified foods: Some plant-based milk alternatives, such as almond milk and soy milk, are often fortified with calcium.

Calcium is also available in various forms in supplements, including calcium carbonate and calcium citrate. Calcium carbonate is the most commonly used form, but calcium citrate may be easier to absorb for some people.

Side effects and warnings

Excessive calcium consumption can lead to side effects such as constipation, kidney stones, and in some cases affect the absorption of other minerals like iron and zinc. It is important not to exceed the recommended intake without consulting a doctor or dietitian, especially when considering supplements. People with kidney disease or other health issues should be particularly cautious and discuss calcium intake with their healthcare provider.

Frequently asked questions

1. How do I know if I am getting enough calcium?

The best way to determine if you are getting enough calcium is to review your diet and possibly have a blood test. Symptoms of calcium deficiency may include weak bones, muscle cramps, and numbness.

2. Can I get calcium from plant-based sources?

Yes, there are many plant-based sources of calcium, such as green leafy vegetables, nuts and seeds, as well as fortified plant milks.

3. Are calcium supplements safe?

Calcium supplements can be safe for those who have difficulty obtaining enough from their diet, but it is important to follow the recommended dosage and consult a doctor.

4. What is the difference between calcium carbonate and calcium citrate?

Calcium carbonate is the most common form of calcium supplement and should be taken with food for best absorption. Calcium citrate can be taken with or without meals and is often better for those with sensitive stomachs.

5. Can I get too much calcium?

Yes, excessive calcium intake can lead to health problems such as kidney stones and may affect the absorption of other minerals. It is important to follow the recommended daily intake guidelines.