Foods to Fight Fatigue

The Weight of Water

Two-thirds of the human body is made up of water. Without it, we could only live a few days. The fluid helps control body temperature through sweat, moves food through the intestines, and greases the joints. It is also an essential ingredient in the production of energy molecules.

"Dehydration is one of the leading causes of a lack of energy," says Grotto. If you're not well hydrated, your body puts its resources into maintaining your water balance instead of into giving you energy.

Everyone's water needs vary. In February 2004, the Institute of Medicine released a report indicating most people meet their daily hydration needs by using thirst as their guide. In general, the Institute's expert panel recommended that women get about 11 cups of water from food and drink each day, and men get about 16 cups daily. This may seem like a lot of liquid, but 80% of it usually comes from drinking water and other beverages. The other 20% comes from food.

To adequately get your hydration needs, particularly on a hot and humid day, the American Dietetic Association suggests carrying around a bottle of water, or replacing your afternoon soft drink with water. Frozen juice bars or icy treats are also a good idea.

Water is especially important after exercise, with certain medicines, and with a high-fiber diet. Your fluid intake should be adjusted to how much water you're losing, says Finley. "Simple things like stopping at a drinking fountain when you walk by one is a good idea."

Caffeine Fix

More than half of Americans reach for a coffee cup every day, and 25% drink it occasionally, reports the National Coffee Association. This should come as no surprise, as there are those who swear they cannot function without the caffeine.

The compound can be found not only in coffee, but in tea, soft drinks, chocolate, and herbs as well.

John Allred, PhD, a food science communicator for the Institute of Food Technologists, says stimulants like caffeine exaggerate the effect of natural hormones like adrenaline. "They get your heart pumping faster, you respire faster, and that gives you a stimulated feeling," he says, noting the results usually last no more than two hours.

Psychology tests have shown a combination of caffeine and sugar can improve alertness and performance. "But then it wears off, and then you get a little bit of a slump afterward," says Camire. The high-low effect of caffeine, she says, is not as pronounced as it is in sugar, but is significant enough in that frequent users often experience headaches without the substance.

The chemical is, indeed, so potent a stimulant that the National Collegiate Athletic Association (NCAA) lists caffeine as one of its banned drugs, as long as the concentration in a urine sample exceeds 15 micrograms per milliliter. (Two cups of black coffee will produce urine levels of approximately 3 to 6 micrograms per milliliter, according to the National Center for Drug Free Sport.)

The effect of caffeine varies from person to person. Some people need a few cups before experiencing stimulation, while others feel shaky or jittery with one serving.

Caffeine can also interfere with sleep, particularly if it is consumed in the late afternoon. The lack of shuteye could obviously affect one's energy level. To resolve this issue, Camire recommends switching to decaffeinated beverages by about 3 p.m. She also suggests gradually cutting back on caffeinated drinks, especially since they may have a dehydrating effect.

Beating the Doldrums

Food can, indeed, raise or diminish the body's energy levels. If you are eating healthy and are still tired, try changing the frequency of your meals. Some people find they get more of a boost with several small meals throughout the day, while others prefer the dining concept of three square meals daily. There's no right or wrong way, says Sandquist, noting that everyone's energy needs differ.

The amount of food you eat can also make a difference. If someone overeats constantly, they tend to gain more weight and become lethargic, says Finley. "It's like the snowball rolling down the hill," he explains. "As [overeaters] get more overweight, they have less energy, and then they exercise less and don't burn the calories."

Other dietary reasons for fatigue include too much alcohol (which is a depressant) and lack of certain vitamins and minerals. Low iron is a common problem for women.

If you still find yourself sluggish with a well-balanced diet, then a visit to the doctor may be in order. Certain diseases, medications, stress, and inadequate sleep and exercise can contribute to fatigue.