Its all CICO and mentality So my stepsister has always been fairly thin. She lost her baby weight after her first child pretty quickly and then had another baby last year. She gained more weight with the second one than the first but was actively trying to lose weight right after he was born. She picked up running and was trying to eat healthier. She was upset because the weight wasn't coming off as fast this time as the first time. She was complaining about it one day and was saying that she was running so much and eating healthy and didn't understand why she wasn't losing any weight. That's when her husband looked at her and said "well, you have two snack cakes in your lap and one you're currently eating....." She was immediately like ".....you right." And then she lost all her baby weight over the next two months and is thin again.   It's all about mentality and fats can't change theirs.