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Exercise for at least half an hour at least three times a week.

Your workouts do not have to be exhausting to "work". Simply walking for half an hour can also release endorphins that are more often associated with the "runner's high." Dr. Robert E. Thayer of the California State University at Long Beach says that the more steps you take, the better you will feel throughout the week, not just during your walk. It can be as simple as walking to the supermarket or to your friend's house. You don't have to go to the gym for your movement to count as "exercise"!
Don't be afraid to eat snacks
Nibbles of food between meals keep blood sugar levels from falling. If you don't suffer a crash in your blood sugar levels, you won't be as tempted to overeat at mealtime or to binge on diet-busting sweets.If you are diabetic, snacks require more planning. Diabetics need high-protein snacks rather than high-carb snacks. If you take insulin, you may need more "slow" insulin and less "fast" insulin to keep your blood sugar levels consistent and within your target range.
Stay Hydrated
The process of burning carbohydrates for your body's fuel requires a precise balance between two electrolytes, sodium and potassium. Every time a cell absorbs a molecule of glucose to burn as fuel, it takes three sodium ions in and sends two potassium ions out. Those sodium ions and potassium ions have to come from somewhere and go somewhere. The watery plasma in your bloodstream makes it possible for your cells to burn the sugar that gives you a boost.You don't have to drink water until you slosh. Eight cups, not glasses, of water (about 2 liters) a day really is enough for most people, although your needs will depend on your activities, the weather, and your own needs. And caffeine is not dehydrating — but too much caffeine can also interfere with your energy levels, so watch out if you routinely rely on coffee to keep you energized.
Don't Worry, Be Happy
Excessive attention to life concerns interferes with sleep, and difficulty with sleep is the number one cause of daytime fatigue. How can you stop racing thoughts that keep you awake? The traditional remedy is counting sheep. Very few people make this work.A better way is to monitor your inner talk. If you are an introvert, you probably will feel more relaxed when you notice pauses between the words that make up your active thoughts. If you are an extrovert, then you will probably feel more relaxed when you think in sentences, focusing on your thoughts, analyzing them.
Sing in the Rain
Outdoor air contains more negative ions. These ions make it easier for your lungs to absorb oxygen. The atmosphere is especially charged with negative ions just before and during rain — although it's best if you don't go out when you might be struck by lighting.And the key to maintaining energy without stimulants?
Maintain your locus of control in yourself
People who don't have to take orders usually have higher energy levels. If you have an especially bossy superior at work, or if your significant other tends to manage your lives together, make a point of focusing on those things over which you are in charge. It's not necessarily a good thing, however, to point out to others those ways in which you maintain control of your life. Simply give yourself some areas over which you can maintain complete control, and practice a positive mantra, like "I choose to be positive about my environment".
None of us actually have complete control over our lives, but if we ruminate about that fact, we drain our energy with negative thoughts. Concentrate on the things you are in charge of and that you can improve, instead.
- Krystyn Krusek, "Nine Energy Boosters," Real Simple, accessed 27 May 2011.
- Photo courtesy of jenosaur on Flickr: www.flickr.com/photos/jenosaur/5453422908/