We all get tired sometimes. But, when fatigue stops you from doing the things you enjoy, you need to take some action. You can boost your energy by examining and adjusting four key lifestyle habits: diet, exercise, sleep and attitude.

Eat Right
Your body is a machine. To keep working efficiently, it needs fuel in the form of wholesome, nutritious food. The brain, itself, is a fuel-hungry organ that uses a third of the calories you consume during the day. Start the day with a big breakfast of whole grains, fruit, lean meat and fats like margarine or nuts. A good choice would be a whole grain muffin with peanut butter, a piece of fruit and a glass of skim milk.

Don't consume all your calories in one or two large meals. Instead, eat five or six smaller meals during the day. A full stomach draws blood to the belly and away from the brain. Smaller meals also help keep your insulin level even, avoiding the fluctuations of energy and mood associated with insulin swings.

Stay away from high-sugar foods that can spike your blood sugar and make you feel listless. Consume most of your calories during the daylight hours. A large meal late in the day is not a good idea.

Drink plenty of water. Even mild dehydration can be the cause of fatigue. Dehydration can reduce blood volume and lower the blood flow to your brain. Try to drink about eight glasses of water a day.

Exercise
Maintain good posture. Slouching actually requires extra energy and can lead to even more fatigue. Just a little exercise can make you feel refreshed and ready to tackle the most daunting task. Nothing moves nutrients and oxygen-rich blood through your body and brain as well as exercise. Whether it's a quick stretch accompanied by deep breathing or a 30 minute walk, exercise can be an incredible pick-me-up.

A good exercise program will not only result in increased energy, but it can help keep your muscles strong, your bones healthy and your joints flexible.

Get Some R 'n R
Get plenty of rest. Try to get at least eight hours of sleep each night, and rest frequently during the day. Natural sleep rhythms are reinforced if you go to bed and wake at approximately the same time every day.

Avoid caffeine and snacking on spicy or high-fat foods before bedtime. Both can interfere with sleep. If you feel you need caffeine to stay alert, try a single cup of coffee in the morning and a diet soda with lunch.

Reserve your bedroom for rest and relaxation only. Studying, working or exercising in your bedroom may make it harder for you to wind down and fall asleep in that space.

An afternoon nap can revitalize you. Give your body a break and don't overdo it, even on days when you're feeling good.

Think Positive
Keep a positive attitude and learn to deal with your emotions. Even a little depression can put you in a downward spiral. It can lead to feelings of fatigue, and fatigue can lead to more depression. There is a strong connection between stress and unhappiness and medical problems. Listening to your favorite music, meditating or spending time on a hobby can all be very relaxing and lift your spirits.

Don't let fatigue rob you of enjoying your life every day.