Jobs at Asda stores in Grangemouth and Falkirk are at risk after the company announced plans to overhaul its in-store bakeries at 341 branches across the UK.
A consultation process with more than 1,000 staff has now started.
The move will impact 1,200 workers, although the supermarket giant hopes to redeploy as many as possible to other roles.
Asda said it was treating redundancy as "the last option" during the consultations, which have been sparked by changing tastes among shoppers.
But it's not know how many, if any jobs in the Falkirk district will be affected.
The shift will see a centralised bakery delivering a larger range of pre-baked goods to supermarkets each day, replacing the current model where the goods are baked from scratch on site.
Asda chief merchandising officer Derek Lawlor said: "The current in-store bakery model has restricted our ability to respond to changing customer demands and offer them the speciality products and freshly baked goods they want to buy throughout the day.
"The changes we are proposing will deliver a much better and more consistent bakery offering for customers across all our stores. We know these proposed changes will be unsettling for colleagues and our priority is to support them during this process."
The move was criticised by the GMB union who said it was bad for consumers and employees alike.
Roger Jenkins, GMB national officer said: "Asda's plans to scrap baking their products from scratch on site and replace them with part-baked products from mass producers is not good for the consumer.
"Over 1,000 skilled bakers are now at risk of losing their jobs. GMB calls on Asda to retain these valuable skilled employees and continue to offer the customer truly fresh produce baked by professional bakers."
Asda's move follows a similar decision by Tesco, taken just over a year ago, which put up to 1,800 jobs at risk.
