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The nutritional quality of this type of lunchtime meal still remains low, with the percentage of packed lunches meeting food standards rising to just 1.6% in 2016 from just over 1% in 2006.

The repeat analysis of nutritional content, published in the online journal BMJ Open and carried out by Leeds University, is described as an ‘observational study’, and as such, can’t establish cause.

It also relied on just one day’s packed lunches at both time points, while potentially influential factors, such as deprivation levels, weren’t included.

Despite such limitations, Dr Charlotte Evans of the School of Food Science and Nutrition at the University of Leeds, said: “Although some children’s packed lunches contain healthy foods, packed lunches continue to be dominated by sweet and savoury snack foods and sugary drinks.

“A minority of children eat vegetables or salad and this hasn’t changed in the past ten years.

“Although not directly comparable, results from this 2016 survey confirm that children’s packed lunches have improved in terms of levels of sugar provided, but continue to contain levels of saturated fat, added sugars and sodium that exceed current standards and recommendations.

“Improving the quality of children’s packed lunches is a complex issue which needs strong support from many stakeholders, including government, industry and schools, if this is to improve in the next ten years.”

The study notes that since 2006 steps have been taken to improve the nutritional quality of school meals in England, with schools obliged to stick to a set of standards on what can be included.

But no such rules exist for packed lunches. And because more than half of children take one to school, these meals contribute significantly to a child’s diet, say the researchers.

They wanted to find out if the nutritional quality of children’s packed lunches had improved since 2006, when they last analysed the content of these meals, and whether any changes were associated with the frequency or portion size of particular foods.

The most common examples of particular food categories in packed lunches were similar at both time points. Ham was still the most popular sandwich filling, for example; plant-based fillings, such as hummus or vegetable spreads, made up less than 1%.

But bread type changed, with tortillas and wraps much more popular in 2016 (13% of children) than in 2006 (2%).

The packed lunches analysed in 2016 contained less sugar than in 2006: the inclusion of sweets and chocolate fell by 10% from 62% to 52%, while that of sweetened drinks fell by 14.5%, from 60% to 46%.

But the provision of cakes and biscuits that didn’t contain chocolate increased by nearly 10%, and vegetables remained the least common items, with only one in five children given these in their packed lunches.

And the percentage of children’s packed lunches that met all eight food standards - five healthy food groups plus restrictions on three unhealthy food groups - rose only slightly, from 1.1% to 1.6% in 2016.

Essential nutrients also fell between 2006 and 2016: vitamin C content fell from 58 mg to 30 mg, and few children’s lunches met the recommendations on fibre, vitamin A, iron or zinc.