In giving us children God places us in a position of both leadership and service. He calls us to give up our lives for someone else's sake - to abandon our own desires and put our child's interests first. Yet according to His perfect design it is through this selflessness that we can become truly fulfilled.
I am not naturally that thin so I had to go through everything from using drugs to diet pills to laxatives to fasting. Those were my main ways of controlling my weight.