Tests on more than 200 coffees from popular chains revealed Americanos had the highest caffeine levels—averaging around 140mg per drink—far exceeding home-made coffees' lower amounts.
On average, researchers found that just two to three Americanos were often enough to exceed the daily caffeine limit, highlighting the risks of overconsumption.
Caffeine is a stimulant which can cause insomnia, nausea, and rapid heart rate when consumed in excess, pointing to the importance of monitoring intake.
The NHS recommends limiting daily caffeine consumption to 400mg due to the potentially dangerous side effects, particularly for pregnant women, whose limit is only 200mg.
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