Black tea contains high levels of oxalates which hinder the absorption of essential minerals like iron, calcium, zinc, and copper. Consuming plant-based foods rich in oxalic acid and phytic acid can lead to a net loss of these vital nutrients, particularly if one is unaware of their negative impact. For example, spinach may present as a source of iron, but its oxalate content can interfere with iron absorption, creating a misconception of nutritional benefit. Additionally, while coffee has different effects, if it causes a frequent urge to urinate, this may indicate the presence of toxins like ochratoxin A that can impact kidney and bladder health.

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