Please don't say "aging cell". On two occasions reviewers at the journal were unable to appreciate the importance of the aging component in my work. Oh, and it took nearly 12 weeks each time to get the first responses.
Have you tried Journal of Gerontology Biological Sciences? The editor at JGBS, Rafa de Cabo, has done a lot of work on the interaction between diet-induced obesity and longevity pathways. He should be able to give your manuscript a fair shake.