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One scandal drew attention in 2020 when the Supreme Court of Ireland ruled that Subway's bread contained an excessive amount of sugar, disqualifying it as "bread" under Irish law. This alarming revelation caused many customers to rethink their health-conscious choices at Subway. Additionally, ongoing lawsuits alleged that Subway’s tuna was not actually tuna, further eroding customers' confidence in the food they were served.
These incidents sparked a widespread realization that Subway might not be the healthy alternative it once claimed to be. Research conducted by the Journal of Adolescent Health indicated that a typical Subway meal was comparable in caloric content to meals from McDonald's, further undermining the chain's marketing claims.