Article continues below advertisementJameela Jamil didn't hold back when criticizing Serena Williams.The 39-year-old actress took to Instagram to slam the tennis legend for promoting weight loss medications.Article continues below advertisementSource: MEGASerena Williams revealed she has been using GLP-1 medication for about a year.Article continues below advertisement"Serena Williams is selling GLP-1s," Jamil wrote in her post. "The thing I feel most uncomfortable about here is that celebrities have access to doctors most others don't have access to.