Phytates bind calcium. Phytates found in whole-grains, legumes (dried beans), nuts and soy products bind the calcium of other foods eaten when they are eaten at the same time. When calcium is bound, the body cannot use it.
Net absorption of dietary calcium is also reduced to a small extent by intakes of caffeine and phosphorus and to a greater extent by low status of vitamin D [9-11].
Caffeine, drugs like anticoagulants, cortisone, and thyroxine reduce calcium absorption in the body. Lack of exercise and vitamin d deficiency leads to decrease in calcium absorption.
Vitamin D deficiency: Vitamin D helps your body absorb calcium properly, so a lack of vitamin D in the body can cause low levels of calcium in your blood (hypocalcemia). Vitamin D deficiency can be caused by an inherited disorder or by not getting enough sunlight or not consuming enough vitamin D.
Calcium can affect how the body takes in the nutrients iron, zinc and magnesium. And don't take a calcium supplement at the same time as a meal that's high in iron. Foods high in iron include lean meat and seafood, nuts, beans, vegetables, and grains that have iron added to them.
Use Vinegar & Baking Soda
This process can be used on sink or shower drains. White vinegar is a natural solution that can be utilized to dissolve calcium buildup. Sitting overnight, you will be able to remove lime buildup from the drain while avoiding the harsh chemicals in traditional drain cleaners.
Magnesium is good for allowing your bones to efficiently absorb calcium. Magnesium supplements can support the strength and amount of calcium in your bones.
Muscle cramps involving the back and legs are common. Over time, hypocalcemia can affect the brain and cause neurologic or psychologic symptoms, such as confusion, memory loss, delirium, depression, and hallucinations. These symptoms disappear if the calcium level is restored.
To absorb calcium, your body also needs vitamin D. A few foods naturally contain small amounts of vitamin D, such as canned salmon with bones and egg yolks. You can also get vitamin D from fortified foods and sun exposure. The RDA for vitamin D is 600 international units (15 micrograms) a day for most adults.
Vitamin D. Vitamin D is required for optimal calcium absorption (see Function or the article on Vitamin D). Several other nutrients (and non-nutrients) influence the retention of calcium by the body and may affect calcium nutritional status.
Dietary inhibitors of calcium absorption include substances that form complexes in the intestine, such as phytate. Protein and sodium may also modify calcium bioavailability in that high levels increase urinary calcium excretion.
Caffeine leaches calcium from bones, sapping their strength. "You lose about 6 milligrams of calcium for every 100 milligrams of caffeine ingested," Massey says.
Foods high in oxalic acid also impede the absorption of calcium by binding the mineral. Spinach is naturally high in calcium, but it is also high in oxalic acid. The body is unable to process the calcium it provides. Other foods that contain oxalic acid include beet greens, rhubarb and sweet potatoes.
Your body constantly breaks down old bone and replaces it with new bone. When you're young, this break-down-build-up-process stays in balance and bones stay strong. However, at about age 30, bone mass stops increasing. If your body isn't getting enough calcium, it will take calcium from your bones.
The two most commonly used calcium products are calcium carbonate and calcium citrate. Calcium carbonate supplements dissolve better in an acid environment, so they should be taken with a meal. Calcium citrate supplements can be taken any time because they do not need acid to dissolve.
Magnesium and calcium should not be taken at the same time, as both minerals together can impair absorption in the intestines. An optimal recommendation is to take calcium in the morning and magnesium in the evening. The reason for this is that both have a similar chemical structure.
Unfortunately, coffee is one of the most common things that deplete magnesium stores and absorption in the body, due to the caffeine contained within coffee. Furthermore, there is also evidence that sugar can deplete magnesium, as can calcium.
Things that can inhibit calcium absorption are caffeine, soft drinks, diuretics, excess red meat, refined sugar, alcohol, excess salt, foods high in oxalic acid (spinach, rhubarb, chocolate), and certain medications.
Salty Foods
Eating foods that have a lot of salt (sodium) causes your body to lose calcium and can lead to bone loss. Try to limit the amount of processed foods, canned foods and salt added to the foods you eat each day. To learn if a food is high in sodium, look at the Nutrition Facts label.
High-Sodium Foods
The more salty you eat, the more calcium you lose. “Salt is known to cause excessive calcium excretion through the kidneys,” says Felicia Cosman, MD, an endocrinologist, professor of clinical medicine at Columbia University in New York, and spokeswoman for the National Osteoporosis Foundation.
Avocados are an excellent food to help lower your calcium heart score and treat coronary artery disease. Avocados are full of potassium (even more than bananas). Research suggests that foods rich in potassium reduce vascular calcification.
Bananas do not contain much calcium, but they are rich in FOS, that improve gut microbioma and so calcium absorption.