Why green tea should not be consumed overnight once brew?

There's no scientific evidence to suggest that green tea should not be consumed overnight once brewed. In fact, drinking green tea, even after it's cooled down, can have several benefits:

* Antioxidant rich: Green tea contains powerful antioxidants that can help protect your cells from damage. These benefits are retained even after the tea cools down.

* Hydration: Green tea is a great source of hydration, especially at night when your body is prone to dehydration.

* Improved sleep: While caffeine can interfere with sleep, green tea contains L-theanine, an amino acid that promotes relaxation and may improve sleep quality.

However, there are a few things to keep in mind:

* Caffeine content: Green tea does contain caffeine, although less than coffee. If you're sensitive to caffeine, you might want to avoid drinking it late at night.

* Tannins: Green tea contains tannins, which can interfere with iron absorption. If you're concerned about this, drink your green tea with a meal or take an iron supplement.

* Taste: Some people find that green tea tastes better fresh, but it's entirely up to personal preference.

In summary, there's no reason to avoid drinking green tea overnight once brewed. It can be a healthy and enjoyable way to stay hydrated and get some antioxidants.