A study by consumer group Which? found significant differences in caffeine levels across major UK high-street coffee chains [1].
These findings matter because caffeine intake affects heart rate and sleep patterns, and many consumers are unaware that a single drink can nearly reach daily health limits.
The research measured drinks from Costa, Starbucks, Greggs, Caffè Nero, and Pret [1]. The results showed a stark contrast between brands, particularly regarding cappuccinos. A medium Costa cappuccino was found to contain 325 mg of caffeine [1]. In comparison, a medium Starbucks cappuccino contained 89 mg [1].
This means the caffeine content in a Costa cappuccino is more than three times that of a Starbucks drink [3]. To provide further context, the amount of caffeine in one Costa cappuccino is roughly equal to four cans of Red Bull [2].
Health guidelines suggest a recommended daily caffeine limit of 400 mg [1]. A single medium drink from Costa consumes the vast majority of this allowance—leaving little room for other caffeinated beverages throughout the day.
The study aimed to inform consumers about their actual intake and the potential health implications of these variations [1]. While the brands offer similar menu items, the chemical potency of the beverages differs based on the beans and brewing methods used by each chain [1].
“A medium Costa cappuccino contained 325 mg of caffeine.”
The lack of standardized caffeine labeling in the UK coffee industry creates a transparency gap for consumers. Because a single beverage can provide over 80% of the recommended daily limit, individuals sensitive to stimulants or those monitoring heart health may be inadvertently consuming dangerous levels of caffeine depending on their choice of retailer.
