Slimming down for the second time is indeed more difficult than the first time. That is generally due to physiological and hormonal reasons.
We all make plans before starting any task and it feels good when things go according to that. But when we face a setback we lose motivation to start things all over again. The same goes for weight loss. While trying to lose the regained weight we mostly lose hope and are not enthusiastic about it.
Secondly, if you follow a restrictive diet promising quick weight loss then your hormones start working against you, impacting your body’s ability to shed the regained weight. Strict diet decreases the levels of leptin (the hormone that makes you feel full) and increases the level of ghrelin (the hormone that stimulates hunger) in the body. Studies even show that our body stays in this state way long after you are off the diet.