Fortunately, these factors are all within your control. The following 10 tips can help you maintain your energy through a day at the office and beyond.

1. Eat Right and Don't Skip Meals

Your diet is your primary source of energy. Skipping breakfast or lunch will cause your blood-sugar levels to drop, leaving you feeling foggy and sluggish. If rushed, grab some fruit, veggies or nuts to snack on while sitting at your desk. Energy bars are good options for calories in a pinch, but not for meal replacements. Nutrient-rich foods keep you more consistently energized than processed sugars.

2. Just Say No to Caffeine

Stop bingeing on coffee, tea and energy drinks. Not what you expected to hear? While these products provide a quick boost, it's short lived and requires constant replenishment. Consider green tea as a substitute as it can offer the highest levels of antioxidants and provide just the right amount of caffeine without making you jittery.

3. Eat Fresh to Stay Fresh

Avoid the vending machine and its cornucopia of refined sugars and processed foods. Nibble on fresh fruits such as apples, berries and bananas. Whole fruit always trumps juice and bars due to the lack of processed sugars and other additives. Stay natural. Mix it up and stay in season.

4. Go Nuts for Nuts

Along with fresh fruit, fill up on nuts such as almonds and walnuts. Both provide your body with good fats that boost brainpower. Sunflower seeds are another simple healthy snack.  For a more filling midday treat, consider peanut butter on celery or whole-grain crackers. Not only is this combo packed with slow-burning protein and fat, it also provides a quick carb blast that boosts energy. Just make sure you practice moderation when it comes to these snacks. Carbs turn into sugar in your system, and nuts are very high in fat. Too much of either can lead to weight gain.

5. Yo, Yo, Yoghurt!

Yoghurt is a high-protein meal that will provide a much-needed lift. Sweeten it with a few fresh berries and you've double-dipped your way to energy abundance. Fat-free Greek yogurt is a fine choice that's high in protein and amino acids. Frozen yogurt may sound like a viable option, but it can be high in sugar and is best reserved for dessert.

6. Walk the Walk

Move it or lose it. Staying sedentary for long periods of time will drain you, and just 10 minutes of walking or stretching at your desk can do wonders for replenishing energy levels.

Walk the floor you work on. Interact with your co-workers. Not only will the physical activity bring you back to life, but engaging in conversation and exchanging ideas will stimulate you. Or take it outdoors and soak in some of Mother Nature's free vitamin D. A few minutes of sunshine and fresh air will enliven you in a way that artificial lighting and circulated air cannot.

7. Activate your Brain

You're not a drone. Throughout your work day, shift your mental gears by focusing on something, anything, other than work for a few minutes. Try a word jumble, a crossword or engage in a conversation about a topic outside of the office.

8. Chocolate is Your Friend

Yes, you read that correctly. An ounce of dark chocolate provides a mild stimulant as well as ample antioxidants. It can boost memory and lower cardiovascular risk. Plus, it tastes great. Anything above 70 percent pure cacao is good, but 85 to 90 percent is best.

9. Smells like Energy

Peppermint, lime and grapefruit scents are reported to have the greatest effect on raising energy levels. But before you fill the air with aromatherapy, check with co-workers so you don't infringe on someone else's olfactory preferences.

10. Pump up the Jam

Music is a mood modifier. One song can take you from singing the blues to dancing on the ceiling. Wear headphones or use common sense on song selection at work. Don't drop the beat on explicit lyrics, and keep the volume down... You're not the office DJ. 

Celia Donne, Global Operations Director, Evans Easyspace, comments: "Everybody needs a pick me up now and then and these tips can help re-charge the batteries during busy times.  Businesses are paying far greater attention to the well-being of workers and bosses can play their part by encouraging staff to take regular breaks from the screen or even providing a ready supply of fresh fruit and healthy nibbles."