Holiday Indulgence and Stress

There's a reason the holiday season feels like a permission structure. Permission to eat the things you normally don't. To drink more than usual. To stay up later than your body is comfortable with. To skip the workout because you're busy. To treat December as a different category of month where the normal rules don't apply.

And in the moment, these choices feel like relief. After a stressful week of work deadlines and family logistics and financial pressure, the sugary dessert and the glass of wine and the late-night socializing feel like you're finally letting go. Finally enjoying something. Finally giving yourself what you've been withholding through the discipline of the regular year.

The problem is what happens at the physiological level between the feeling of relief and the morning after. Because what feels like stress relief is often, at a biological level, adding to the stress load it was supposed to relieve.

What Happens When Blood Sugar Swings

Sugar and refined carbohydrates produce a rapid increase in blood glucose. The pancreas responds with insulin to bring it back down. If the dose is large enough — a slice of pie, a handful of holiday cookies, the dinner rolls plus the stuffing plus the dessert — the insulin response overshoots and blood sugar drops below baseline. The nervous system, interpreting the blood sugar drop as a threat, releases adrenaline and cortisol to mobilize glucose from liver stores.

That cortisol release is a stress response. It produces the physiological signature of a threat — elevated heart rate, increased alertness, mild anxiety, disrupted sleep if it happens in the evening. And it drives cravings for more fast-burning carbohydrates to bring the blood sugar back up — which creates another spike, another overshoot, another cortisol release.

This cycle — spike, crash, cortisol, cravings, spike again — is the metabolic swing that characterizes holiday eating patterns. And a nervous system that is already under the significant stress load of the holiday season — the financial pressure, the family dynamics, the schedule disruption, the end-of-year work demands — is running on a cortisol budget that the metabolic swings are drawing from.

The combination of external life stress and metabolic stress from blood sugar instability creates a cortisol load that exceeds what either would produce alone. The anxiety that feels disproportionate to the situation in late December. The fatigue that doesn't improve with rest. The mood instability that makes the holidays harder than they should be. These are often as much metabolic as they are emotional.

What Alcohol Does to Stress Physiology

Alcohol produces its relaxing effect by enhancing GABA — the inhibitory neurotransmitter that slows nervous system activity. In the short term, this genuinely does reduce the experience of stress. The muscles relax. The anxiety quiets. The social situation feels easier.

What happens four to six hours later is the rebound. As alcohol is metabolized, GABA activity decreases, and the nervous system rebounds into a more activated state than it was before drinking. This is the physiological mechanism behind the 3am waking that characterizes nights after drinking — the nervous system has rebounded from alcohol's inhibitory effect into a hyperactivated state during the middle of the night, producing disrupted, non-restorative sleep and elevated cortisol through the sleep period.

The next day, the sleep disruption, the dehydration, and the alcohol metabolite acetaldehyde all contribute to elevated cortisol and impaired nervous system regulation. The "hangover" is in part a stress response — the body managing the aftermath of alcohol metabolism alongside whatever it was already managing before the drinking started.

For someone already running a high stress load in November and December, the evening glass of wine or holiday cocktail that feels like stress relief is producing a physiological stress response several hours later that adds to the load rather than reducing it.

The Sleep Disruption Multiplier

Blood sugar swings disturb sleep. Alcohol disturbs sleep. Late nights disturb sleep. Holiday travel disturbs sleep. The combination of all four — which is a common pattern across November and December — produces significant sleep disruption that amplifies everything above.

Sleep deprivation is one of the most potent drivers of cortisol elevation, insulin resistance, inflammatory signaling, and the hunger hormone dysregulation that makes food choices harder the following day. The ghrelin and leptin dysregulation from a poor night's sleep — which increases hunger and reduces satiety — is one of the strongest predictors of next-day overeating. The cycle continues.

One disrupted night is manageable. A pattern of disrupted sleep across eight weeks is a cumulative physiological stress event — one that compounds the effects of the dietary and alcohol patterns and produces the sense of being profoundly run down that many people carry into January as the residue of a "restful" holiday season.

Indulgence Without the Metabolic Swing

This is not an argument for a perfectly clean holiday. Shared food and drink are meaningful social and cultural experiences that have value beyond their nutritional content, and the psychological benefit of enjoying the season without constant vigilance is real.

It is an argument for understanding what indulgence is doing at the physiological level — so that the choices are genuine choices rather than automatic responses to an environment designed to override them.

The strategies that reduce the metabolic swing while preserving the enjoyment include anchoring holiday meals with protein before the carbohydrate-dense foods, which slows the glucose absorption and reduces the spike. Spacing the indulgent foods — the same amount of food consumed over a longer period produces a smaller glucose spike than the same amount consumed rapidly. Staying hydrated, which supports the metabolic processing of both sugar and alcohol. Protecting at least some nights of sleep during the season — not every night, but enough that the cumulative deficit doesn't compound.

And recognizing that some of what feels like holiday stress is metabolic — and that managing the metabolic contribution to the stress load makes the genuinely difficult parts of the season easier to navigate.

Your nervous system is doing significant work in November and December. The care you receive at Breathe — chiropractic, acupuncture, massage — supports the nervous system regulation that determines how well you manage everything the season brings. Keep those appointments through the season. They matter more, not less, when everything else is more demanding.

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Dr. Carla Freeman, DC | Breathe Chiropractic | Phoenix AZ | (602) 254-2454