Caffeine may reduce the absorption of manganese, zinc and copper. It also increases the excretion of the minerals magnesium, potassium, sodium and phosphate. There is also evidence that caffeine interferes with the action of vitamin A.
Christian Goldsmith from Auburn University, Alabama, USA, have discovered that zinc can protect against the superoxide responsible for oxidative stress when taken together with a component found in foodstuffs such as wine, coffee, tea and chocolate.
Coffee strips your body of key vitamins.
Maybe your thinking, “vitamins, schmitamins.” But here's the deal, too much coffee depletes your supply of B vitamins, which is your natural source of energy. Caffeine also causes the body to dump other key nutrients like calcium, magnesium, potassium and iron.
Caffeine has a mild diuretic effect, which leads to an increase in urination. As a result, water-soluble vitamins, such as B-vitamins and vitamin C can be depleted due to fluid loss. Research also demonstrated that the higher the level of caffeine, the more it interfered with vitamin D absorption.
Zinc deficiency can occur in people who consume excessive amounts of coffee and foods rich in iron, copper, calcium, phosphorus, fibre and phytic acid.
Zinc deficiency can happen in people who have problems absorbing nutrients, for example, older people and those who have some gut diseases. Some medicines can also increase the loss of zinc through urine.
Phytate, which is a natural component of plants, severely decreases intestinal zinc bioavailability and is regarded as the main nutritional inhibitor of zinc absorption.
The tannins and caffeine can interfere with the absorption of many vitamins and minerals, especially iron. Caffeine also increases urination, which can decrease the concentration of water-soluble vitamins (B-complex and C). So, wait an hour after your morning brew to take supplements.
"The coffee isn't leeching the magnesium out," he explains. "The coffee itself [may reduce] your intestine's ability to absorb [magnesium], which over time can result in a magnesium deficiency." Another thing to note: Many of these studies are small or performed on rats, so the relationship still needs more study.
Caffeine drinking has been shown in several studies to correlate with markedly lower circulating B-vitamin concentrations. Coffee drinkers also tend to have higher levels of homocysteine, which is a surrogate marker for vitamin B12 and folate deficiency.
Common substances — such as sugar and caffeine — deplete the body's magnesium levels.
Can impact nutrient absorption. Caffeine can also affect your body's absorption of minerals such as iron and zinc which may lead to iron deficiency anemia (10). If you think you might have a mineral deficiency, read up more on that topic here and consider getting blood tests done by a doctor.
An increased intracellular shift of potassium and increased loss of potassium in urine due to the diuretic action have been suggested to be the causes of caffeine-induced hypokalemia.
Do not take zinc supplements and copper, iron, or phosphorus supplements at the same time. It is best to space doses of these products 2 hours apart, to get the full benefit from each dietary supplement.
Nonsteroidal anti-inflammatory drugs (NSAIDs) -- Zinc interacts with NSAIDs and could reduce the absorption and effectiveness of these medications. Examples of NSAIDs, which help to reduce pain and inflammation, include ibuprofen (Advil, Motrin), naprosyn (Aleve), piroxicam (Feldene), and indomethacin (Indocin).
Its absorption is most effective on an empty stomach, but it can cause stomach upsets. In this case it should be taken with a meal and therefore not late at night. Zinc competes with iron and calcium for absorption, which is why the recommendation is taken in meals that do not contain dairy products.
Magnesium deficiency in healthy people is rare but it can be caused by: a poor diet (especially in elderly people or those who don't have enough to eat) type 2 diabetes. digestive problems such as Crohn's disease.
Caffeine leaches calcium from bones, sapping their strength. "You lose about 6 milligrams of calcium for every 100 milligrams of caffeine ingested," Massey says. That's not as much of a loss as salt, but it's worrisome, nonetheless.
Mg is essential in the metabolism of vitamin D, and taking large doses of vitamin D can induce severe depletion of Mg.
Caffeine can interfere with the absorption of certain minerals, including magnesium, calcium, and iron, but the loss is minimal.
The study's findings indicated that caffeine lessened the expression of vitamin D receptors on the body's osteoblasts, which are the cells that secrete the substance of bone. This research also suggested correlation between the degree of interference with vitamin D absorption and the amount of caffeine in the body.
Zinc is best absorbed when taken with a meal that contains protein. The best sources of zinc are oysters (richest source), red meats, poultry, cheese (ricotta, Swiss, gouda), shrimp, crab, and other shellfish.
Amino acids, such as histidine and methionine, and other low-molecular-weight ions, such as EDTA and organic acids (e.g., citrate), are known to have a positive effect on zinc absorption and have been used for zinc supplements.
Animal protein (e.g., beef, eggs, cheese) has been shown to counteract the inhibitory effect of phytate on zinc absorption from single meals (Sandström and Cederblad 1980), but this may be due to amino acids released from the protein that keep the zinc in solution (see later) rather than a unique effect of animal ...