A German consumer group has blown the cover on the change in Nutella's ingredients after noticing the colour of the popular chocolate spread has lightened.

"Since the colour of the new Nutellas is brighter, we assume that more milk powder was added at the expense of cocoa. Cocoa slipped back in the list of ingredients," says the Hamburg Consumer Protection Centre in a Facebook post, in a translation that was originally posted in German. 

The consumer group says the revised formula contains 1.2% more powdered skim milk at 8.7%, has increased its sugar content by 0.4% to 56.3%, and decreased its fat content by 0.9% to 30.9%. 

"Whether or not the contents of other ingredients such as sugar or palm oil have been altered remains unclear," it says in the post.  

Nutella's Italian manufacturer, Ferrero, confirmed its international formula has been tweaked, but not before its fans took to twitter to promote the movement #boycottnutella.

A local spokesperson for Ferrero told CHOICE there will be no changes made to the formula of Nutella sold in Australia.

"It is an international change, which does not affect Nutella product made in Australia," she says. 

"The international change is only fine-tuning where whey powder, a milk derivative, has been replaced with a little increase of the already present skimmed milk powder.  The quantity, quality and sourcing of the hazelnuts ingredient remains the same."

It is not known if the formula of Nutella sold in Australia will be changed in the near future.

But overseas fans of the popular spread say the tweaks to Nutella have changed the taste – not necessarily for the better.

Update, 2.50pm: This article has been updated to include commentary from a local Ferrero representative. The representative confirmed there is no change to the formula of Nutella that is currently sold in Australia.