[header] How to lose weight while pregnant [title] Do not try to diet while pregnant. [step] You should never try to lose weight while pregnant unless your doctor specifically tells you otherwise. Do not start a weight-loss regimen after you find out that you are pregnant. 
It is actually recommended that all women gain weight during pregnancy. [substeps] Obese women should gain between 11 and 20 pounds (5 and 9 kg).