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All these methods, which are also used to make decaffeinated tea, start with green, or unroasted, coffee beans that have been premoistened.

In the CO₂ method, liquid carbon dioxide is pumped into a high-pressure chamber with the beans, where it binds to the caffeine and is then removed through high pressure, leaving behind decaffeinated beans.

The researchers found that increasing unsweetened caffeinated or decaffeinated coffee intake by one cup a day was associated with a weight gain that was 0.12 kg less than expected over four years.

I found a natural way to decaffeinate a tea: steep for 30 seconds, then toss out the liquid and brew the same tea bag in fresh hot water.

But in the 20th century, TCE was used for many purposes, including making decaffeinated coffee, dry cleaning, carpet cleaning, and as an inhaled surgical anesthetic for children and women in labor.