Nestle said it expected its operating margin to slip by 40 to 60 basis points in 2017 due to higher restructuring costs from a faster overhaul.

The company said its full-year organic sales growth should be in line with the 2.6% seen in the first nine months. 

But the world's biggest food company said its underlying margin, which strips out costs of closing factories and other charges from its revamp, was set to improve. 

Makers of packaged foods are under pressure to review their business models and brand portfolios to satisfy consumers' appetite for fresh, healthy, local foods, while at the same time improving returns to silence increasingly vocal activist investors. 

The maker of KitKat chocolate bars and Nescafe instant coffee said today that restructuring was progressing faster than planned, taking overall spending to as much as 1 billion Swiss francs ($1.02 billion) this year. 

"We maintain our guidance for overall restructuring costs of up to 2.5 billion francs until 2020," the company's chief finance officer Francois-Xavier Roger said. 

Organic sales growth accelerated to 3.1% in the third quarter, from 2.3% in the first and 2.4% in the second, Nestle said. This matched the forecast in a Reuters poll. 

In the nine-month period, sales reached 65.272 billion Swiss francs as growth in Asia and Europe picked up, while in the Americas sales growth eased, Nestle said. 

Organic growth in North America was flat, the company said, citing soft consumer demand, with a decline in sales volumes particularly in confectionery and ice creams. 

Roger said he still expected the sale of Nestle's US confectionery business by the end of the year.