You'll soon see fewer ads for "flat tummy" tea and lip fillers on Instagram. The social media platform announced today that it is tightening restrictions on posts related to diet products and cosmetic surgery. The new rules -- first reported in the London Evening Standard -- will apply to both Facebook and Instagram, and will result in age restrictions being applied to some posts and other posts being removed entirely. The social media platforms will ban posts promoting dubious weight loss products that are linked to a commercial offer (like a discount code). Furthermore, both will restrict users who are under 18 years old from viewing content that promote the use of certain weight loss products and cosmetic procedures.