Most people eat the Standard American Diet (SAD) which is high in processed foods, refined sugars, and caffeine and low in nutrients.  This is a draining diet, leaving one feeling tired and depleted.  Refined carbohydrates like white bread, white rice, and all white flour products act similar to refined sugar, releasing quickly into the bloodstream.  The pancreas reacts by sending insulin.  It knocks glucose out of the bloodstream and stores it as fat.  This can lead to excess fat and weight gain around your middle.  It also can lead to a rollercoaster cravings for sugar and refined carbs.  The key to reducing these cravings is to maintain blood sugar levels throughout the day.  To stabilize blood sugar levels you must:

Eat a whole foods diet:  foods that are unprocessed and unrefined, chemical free.

Great examples of whole foods are organic vegetables and fruits, free-range organic meats, beans or legumes, nuts and seeds, unrefined oils like olive oil and flax oil, and whole grains, like brown rice, quinoa, buckwheat, or amaranth.

Eat a variety of whole foods to ensure you get the vitamins/minerals your body needs.  Think about what you should eat.  I recommend eating from the outer rim of the grocery store which usually stocks fresh foods (produce and meats).  The  middle of grocery store is typically processed/packaged foods.  Whole foods will nourish your body, create satiety, and reduce sugar cravings.