And to lose weight fast and effectively four aspects of life should be changed: what to eat, how to eat, behavior and activity level. Last but not least, your vegetarian weight loss plan should also include getting quality sleep and consume adequate amount of water for proper hydration, so that you can detox optimally and lose weight effectively as a vegetarian with half the effort and time. In 2012, she regained her slim pre-pregnancy body just three months after giving birth to son Camden.