4. Alter Macro-nutrient Intake
Although it sounds complicated, once again, the idea is to change what you are eating. If (for example) you are eating a moderate diet that is higher in carbs - try eating less carbs and more protein. There is no need to get super-technical over the whole thing. If you have a carbohydrate snack every day at morning tea time - change it to a protein snack. Whatever you are doing consistently - try mixing it up a bit.
5. Change Meal Frequency
If you are eating three square meals a day - start adding snacks in between (which may mean reducing the portion size of the main meals). Eating often is an old and common style of eating - once again, you are trying to boost your metabolic rate.