A woman takes a photograph using a smartphone at a Ferrero SpA's Nutella pop up store inside Pacific Place shopping mall in the Admiralty district of Hong Kong.

Nutella has a new recipe, and people are not happy.

The Hamburg Consumer Protection Center noted the chocolate hazelnut spread now has more sugar and milk powder but less cocoa. Plus, the color is brighter.

Angry fans condemned the change on Twitter. Some went so far as to create the hashtag #NutellaGate.

Ferrero's Nutella USA confirmed the recipe changed in tweets responding to criticisms.

One tweet said, "our recipe underwent a fine-tuning and continues to deliver the Nutella fans know and love with high quality ingredients." Another said, "sugar, like other ingredients, can be enjoyed in moderation as part of a balanced diet."

Ferrero did not immediately respond to CNBC's request for comment.

"our recipe underwent a fine-tuning and continues to deliver the Nutella fans know and love with high quality ingredients"

"sugar, like other ingredients, can be enjoyed in moderation as part of a balanced diet."

"Please don' t change the recipe of Nutella!"

"Dear @NutellaUSA @NutellaGlobal Do u remember #NewCoke? Yeah, that worked real well!"