They have all promised to reduce sugar content in the targeted products by 10% by the end of 2024.
The Milan Declaration is an initiative of the Federal Food Safety and Veterinary Office that was first drawn up in 2015.
The new companies include Coca-Cola Switzerland, Rivella and supermarket chain Volg.
The Swiss population consumes on average 100 grams of sugar, or 25 sugar lumps, per day, which is twice as much as recommended by the World Health Organisation (WHO).
Excessive sugar intake can lead to a variety of health problems including diabetes.
Since 2018, the sugar content in yoghurts on the Swiss market has fallen by 5% and by 13% in breakfast cereals, food safety officials stated on Tuesday.
However, no company has yet agreed to limit the amount of salt in food products. Swiss people on average consume nine grams of salt per day, which is also above the WHO recommended limit of five grams.
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Food companies agree to cut back on sugar
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Ten food producers and distributors have signed an agreement with the Swiss interior ministry, promising to rethink the sugar content of their breakfast products.
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The interior ministry and the Swiss food industry have agreed to further cut sugar in yogurts and breakfast cereals as part of the official strategy.
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