All well and good. Binge drinking can help you relax (short term) and teaches you how to deal with discomfort in a very physical way too. But I don't recommend it for anxiety. Binge drinking and heavy alcohol use will often make anxiety much worse.
Why does yoga help and a flood of alcohol hurt? Well, the money is on GABA. Gamma-aminobutryic acid is a neurotransmitter I've made brief mention of before. GABA is the chief inhibitory neurotransmitter in the mammalian nervous system. It cools things off and chills things out. People with depression and anxiety have been shown to have low amounts of GABA in their cerebrospinal fluid. MRI spectroscopy has been used to estimate the amount of GABA in people who are depressed, and the levels are low compared to controls (3).
Activate the GABA receptors in the brain with ambien, Xanax, a glass of wine, and you get relaxed and sleepy. When these substances are constantly in the brain and then rapidly withdrawn, you suddenly have overexcited GABA receptors and you can get unfortunate side effects such as insomnia, anxiety, and seizures.
Medicines often used for anxiety or seizures (or both) increase GABA itself. These treatments include depakote, lithium, SSRIs, tricyclic antidepressants, and a treatment for very resistant psychosis and depression, electroconvulsive therapy (shock treatments). And researchers at Boston University Medical School have found increases in the brain (measured via MRI) with yoga (3).
The study I have full access to is a pilot study of 8 experienced yoga practitioners and 11 comparison subjects. None had any history of psychiatric illness or seizures. The yoga people were asked to do 60 minutes of yoga postures and breathing. The control group was asked to read quietly for an hour. Then everyone got an MRI spectroscopic examination. Fun! The people who did yoga ended up with 27% increase in GABA in their noggins compared to controls. Since GABA is relaxing and anti-anxiety, that's good! Turns out, though, that the yoga peeps had lower baseline GABA, but since the study was so small, it just so happened that all the women in the yoga group were in the luteal phase of the menstrual cycle (the second "premenstrual" half, after ovulation), and the women in the controls happened to be in the follicular stage. Turns out that our GABA levels are lower in the "premenstrual" half of the cycle (so give me that glass of wine, honey....).
Recently, the same group at BU did a second, somewhat larger study (4) comparing walkers and yoga practitioners. (I won't have access to the full text of this study for 3 months unless I go to the actual medical library. Uncool, Journal of Alternative and Complementary Medicine!) Again, healthy people were studied, not anyone with psychiatric illness. This time, 19 yoga practitioners and 15 walkers did yoga or walked for an hour three times a week for twelve weeks. The yoga practitioners reported improved mood and anxiety compared to the controls, and MRIs showed increased GABA in the thalamus of the yoga practitioners compared to the walkers.
Yoga isn't Paleolithic. I don't see our distant ancestors practicing downward facing dog. But yoga combines physical activity with forced acute attention on the present. Lose your focus in tree stand, and you lose your balance. In my mind, yoga and other mindful meditation practices emulate, to some respect, the focus and attention we had to have while hunting and gathering. We couldn't be thinking about the mortgage or Uncle Phil getting drunk at last year's Christmas party. We had to be focused on the trail and the prey.
There are many ways to add mindfulness and a present focus to our everyday lives, and growing evidence that it is good for our brains to do so.
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