A ban on adverts for junk food that are shown during TV programmes aimed at kids aged under 16 has been brought in.
From now on adverts for foods high in fat, salt and sugar are going off air on all kids' channels and in between all kids' shows.
It's part of a drive to cut the number of overweight children to make kids more healthy by eating less junk food.
But some people want the ban to go further - they say junk food ads shouldn't be shown before 9pm.
And some of the people who run kids' TV channels say they won't be able to afford to make as many good programmes without the money they are paid by junk food advertisers.
Junk food ads were already barred from being shown during shows aimed at kids aged seven to nine.