Sales of packaged doughnuts in the US have continued to fall in recent weeks, as the popularity of low-carbohydrate diets continues to eat into business.

According to market researcher Information Resources Inc, the volume of industry-wide doughnut sales slid 2.3% in the 12 weeks to 13 June compared to the year-ago period. In the 12 weeks to 16 May, volume doughnut sales dropped 1.8% from the year-ago period, reported Reuters.

The data includes doughnut sales at grocery stores, drugstores and mass merchandisers, but excludes sales at Krispy Kreme stores or Wal-Mart outlets.

In early May, US doughnut maker and retailer Krispy Kreme issued a profit warning, which it attributed to the popularity of low-carb diets. The company said that market data suggested consumer interest in reduced carbohydrate consumption had heightened significantly following the beginning of the year and had accelerated in the two to three months prior to the company’s profit warning.

Krispy Kreme said the low-carb phenomenon had mostly affected off-premises sales channels, in particular sales of packaged doughnuts to grocery stores.