1)STOP THE JUNK FOODS.
2) Keep away from high fructose/high maltose anything or any artificialy sweeteners(e.g. aspartame, aceflame-K(aceflame-potassium). These are NOT natural sugars. Use items that are sweetened with cane sugar(100% if possible(if you are young, you will need your energy otherwise you can check into something called stevia(do research if you have any medical issues)
3) CHANGE YOUR DIET--> drastic changes cause major issues, therefore you need to wean your body off of conventional snacks into the more healthy items. A simple thing like when you are cooking pork,chicken or any meat with fat, is to remove as much fat as is possible(you don't need all that extra being stored). Cut back on the amount of chicken and chips and double-beef burgers etc. The type of oil used is also extremely important (grapeseed,olive,coconut oil and other seed oils) are healthy to use. However the usage of normal vegetable oil,soybean oils etc can fast become problematic. Interestified, hydrogenated, partially-hydrogenated oils are 1-molecule away from plastic(which btw is what is used in margerine and even in some "butters".) Therefore try and use butter and not margarine. Simple test you can try with your current butter is to leave it out and see how long it takes to turn into oil. good butter turns very soft and pretty much turns back into oil at room temperature. Increase the amount of veggies you intake and cut back on the sugars.IT'S EASY FOR DISEASES TO THRIVE IN A BODY FULL OF SUGAR.
4) Whole food mulitvitamins are also key since they give you what your body needs and in case of any excess you dispose of it through usually sweat and urine. The best ones I know of offhand are located at drinkyourvitamins.com and www.appliedhealth.com( you can get something called multiple essential)
5) the electronics usage may have also skyrocketed with everything going wireless:your internet, your Wii, your cellphones, your computer, even the tv etc
The signals these give off mess with the natural rhythm of your body especially your brain. Making you feel tired although you are sleeping your usual hours. Try cutting off usage of all of these items at least 1 hour before bed.
The plus on top of all this is after a while you will stop getting sick with the common cold etc because you will have built up your immune system.
USE A LOT OF FRUIT SMOOTHIES AND TAKE A DETOX EVERY ONCE IN A WHILE (BOTH BODY AND BLOOD)