Natural and unprocessed foods have more fiber which is a good source of energy and increases your digestive system. Other than this, they have blood sugar spikes which keep a track of insulin levels in your body, thereby keeping a check on your weight. These foods are a rich source of vitamins, minerals and other nutrients and do amazing wonders to your body.
However, metamorphosing to natural food is not the complete solution to your weight related issues, regular exercise is also very important. So, get rid of junk food and add a bit of physical exercise in your daily life and achieve a slimmer and healthier body.