Most of the bread contains sugar, especially white ones. In case you want to consume bread you can replace 1 chapati with 1 slice of multigrain bread. During weight loss, bread may cause constipation so I usually avoid it. Also, it is of more calories than normal chapati and not satisfying as compared to roti. Lifestyle modification is basically adding a known 'plus' to your routine and removing known 'minus' from your routine.