One of my favorite "green and leafy" vegetables is alugbati. It maybe "foreign" elsewhere but here in Iloilo it is as common as kamote and kangkong as one always see these trio being sold from wet market stalls and even in big grocery stores like SM. Most often alugbati is partnered with kalabasa for a simple dish with either pork (cutlets or ground) or seafood (shrimps, crabs and dried seafood like pinakas, balingon, etc) as sahog. Its also a simple dish to prepare as you throw in everything, season then cover and wait for it to cook.
Then you can enjoy a meal that is rich not only with fiber but also other important nutrients that our body needs.