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Blood glucose instability is a huge problem that affects the moods of millions of people. The brain accounts for only about 2 percent of body weight, but requires 25 percent of all blood pumped by the heart (up to 50 percent in kids). Therefore, low blood sugar hits the brain hard, causing depression, anxiety, and lassitude. If you often become uncomfortably hungry, you’ve got a serious problem and should solve it. Eat high-protein, nutrient-dense meals, and snack enough to keep your blood sugar up, but not with insulin-stimulating sweets or starches. Remember that hunger kills brain cells, just like getting drunk. Be careful of caffeine, which causes blood sugar swings, and never crash diet. Food sensitivities are common reactions that are not classic food allergies, so most conventional allergists underestimate the damage they do. They play a major role in mood disruption, much more frequently than most people realize. They cause chemical reactions in the body that destabilize blood sugar and wreak havoc upon hormonal and neurotransmitter balance. This can trigger depression, anxiety, impaired concentration, insomnia, and hyperactivity. The most common sensitivities, unfortunately, are to the foods people most often overconsume: wheat, milk, eggs, corn, soy, and peanuts. The average American gets about 75 percent of her calories from just 10 favorite foodstuffs, and this narrow range of eating disrupts the digestive process and causes abnormal reactions. If a particular food doesn’t agree with you and commonly causes heartburn, gas, bloating, water weight gain, a craving for more, or a burst of nervous energy, you’re probably reactive to it. There are several good books on the subject, and there are many labs that test for sensitivities. Ask a chiropractor, naturopath, or doctor of integrative medicine about them. Don’t expect much help from a conventional allergist. Exercise and Mood Dozens of studies indicate that exercise is often as effective for depression as medication, partly because it increases production of stimulating hormones, such as norepinephrine, and also because it increases oxygen flow to the brain. Exercise can, in addition, help relieve and prevent anxiety, creating a so-called tranquilizer effect that persists for about 4 hours after exercising. Exercise also decreases the biological stress response, which dampens the automatic fear reaction. It is also uniquely effective at causing secretion of Nerve Growth Factor, one of the limited number of substances that cause brain cells to grow. Another benefit of exercise is that it increases endorphin output by about 500 percent and decreases the incidence of major and minor illnesses. For mood, the ideal amount is 30 to 45 minutes of cardiovascular exercise daily. Studies show that exercising less than 30 minutes or more than 1 hour decreases mood benefits.
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Dan Baker (What Happy People Know: How the New Science of Happiness Can Change Your Life for the Better)