The next time you tuck into a chocolate treat, you could be given a health warning, as sweet makers are to let you know exactly what goes into them.
Special labels will go on sweets made by Cadbury and Mars to show how much of things like sugar, salt and fat are in each bar.
They'll also tell you how much of each thing you should be eating each day, in an effort to keep people healthy.
The sweets will also carry messages like "Be active for 30 minutes."
Lots of kids in the UK suffer from obesity, and it's hoped that schemes like this could cut the number of overweight children and adults.