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They may also be less accurate for people with obesity because skin thickness impacts their readings as well.

The government has announced several measures to tackle childhood obesity, including restrictions on junk food advertising on TV, takeaways opening near schools and a ban on multi-buy promotions.

Still, many of the foods that these dyes are in are ultra-processed foods, which have been linked to chronic illness like diabetes, obesity and heart disease.

Some argue the levy disproportionately affects lower-income families and does little to tackle obesity.

It added that it was "committed to tackling the childhood obesity crisis and improving children's health through our Plan for Change".