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Jennifer Lopez<\/b><\/a> has been shedding the pounds since she and estranged husband <\/span>Ben Affleck<\/b> <\/a> called it quits. While she looks fantastic, an insider exclusively tells Life & Style<\/em> that her friends think it\u2019s had a major impact on her mood and general discomfort levels when the cameras are off.<\/p>\n \u201cShe\u2019s dropped so much weight in such a little amount of time that it\u2019s got to be anxiety related. Jennifer hates the direction her life has taken, and she can\u2019t control what Ben\u2019s doing but she can manipulate her diet and exercise regime,\u201d the source explains to Life & Style.<\/em><\/p>\n After noting that focusing on her health has kept Jennifer, 55, \u201csane,\u201d the insider adds, \u201cShe\u2019s working out like crazy, mornings and afternoons for hours at a time.\u201d<\/p>\n Not only is Jennifer working out more than usual, but the source claims she is also strict about her diet. \u201cShe\u2019s not eating nearly enough, just salads by the look of her. No wonder she\u2019s walking around with a rumbling tummy and is cranky,\u201d the insider continues. \u201cShe flies off the handle quite easily and gets emotional about stuff she wouldn\u2019t have batted an eyelid over before.\u201d<\/p>\n \u201cPeople around her just wish she\u2019d eat a sandwich or have some chocolate,\u201d the source concludes. \u201cBut she\u2019s on a mission to get as ripped as possible, especially as she\u2019s back on the singles market<\/a>.\u201d<\/p>\n While rumors first began to swirl that Jennifer and Ben, 52, were having marital issues in May, the \u201cOn the Floor\u201d singer did not confirm their split until she filed for divorce on August 20<\/a>. She didn\u2019t reveal if they agreed to a prenup in the filing, and she requested that neither she nor Ben get spousal support. Additionally, Jennifer listed their date of separation as April 26.<\/p>\n Prior to the divorce filing, an additional insider exclusively told Life & Style<\/em> that Jennifer was focusing on her revenge body<\/a> amid their marital woes. \u201cJ. Lo\u2019s convinced that the best revenge is looking good, so she\u2019s thrown herself into a total body makeover, to the detriment of pretty much every other part of her life,\u201d the source shared on August 1.<\/p>\n \u201cShe can\u2019t stand the idea that people think she\u2019s sitting home alone crying over Ben so even though the last thing she wants to do is put on a smile for the cameras, she forces herself to do it,\u201d the insider continued. \u201cAfter that she\u2019ll do a sweat session in her sauna followed by a cold plunge to burn extra fat and rev up her metabolism before a boring lunch of steamed fish and veggies.\u201d<\/p>\n Neither Ben nor Jennifer have publicly commented on their divorce, though a third source exclusively told Life & Style<\/em> that their split was \u201ca long time coming.\u201d<\/a><\/p>\n \u201cJen and Ben have been separated since April, when he asked for space and moved out,\u201d the insider shared. \u201cUltimately, the marriage was not fixable.\u201d<\/p>\n