How long would it take you to start losing weight if you used to drink one liter of soda a day and now you only drink water and you started exercising for 30 minutes a day and eating less?

* You should see a decrease in weight almost immediately. From what you have described, I would guess you would lose around 1kg (2lb) per week. == == * It all depends on the person. Everyone is different. Therefore, it would be difficult to say. You probably won't notice it yourself. You may only realise it when others do and mention it. It also depends on how much you eat, what you eat, and what type of exercise you do. The best exercise for stomach fat is cardio.