Mei-Shun read an interesting, while a little scary article. Researchers on obesity said that the bigger weight you lose, the easier you will regain it. It is caused by leptin, a hormone secreted from adipocytes, inhibits appetite and activates metabolism. Obese people lose a lot of weight along with leptin, therefore tortured by serious hunger and limited energy consumption in resting state all the time. The only consolation is that she has been plump for almost half her life so far, rather than obese.