Food Science
Mug Shot: Does a Hot Drink Really Warm You Up?
A steaming mug can make the cold feel less bossy within minutes, but a controlled study found a twist: comfort and shivering changed before core temperature did.
Come in from a cold walk, wrap both hands around a steaming mug and the answer seems obvious: of course a hot drink warms you. The mug warms your fingers, the first sip warms your mouth, and the whole ritual can make winter feel considerably less rude. But the body-science version of the question has two parts: does the drink make you feel warmer, and does it measurably raise your core temperature?
A small controlled study put those questions under unusually chilly conditions. Ten healthy young men wore suits circulated with 5°C water until they reached a steady shiver. On separate visits they drank water at 7, 22, 37 or 52°C in two measured servings. Researchers tracked skin and rectal temperature, muscle activity, metabolic rate and how cold the participants said they felt.
The hot water produced a real response. After the larger serving, 52°C water reduced shivering-related muscle activity and metabolic heat production compared with 37°C water, while the cooler drinks increased those cold-defence responses. Participants also reported feeling less cold after the hot drink. Yet the measured skin and core temperatures did not differ between the drink-temperature trials.
That quick split between sensation and thermometer is the interesting part. The researchers argued that temperature sensors inside the body—likely along the gastrointestinal tract—were signalling the nervous system before the swallowed water could substantially change whole-body temperature. Related experiments support that idea: warm or cold water delivered to the stomach changed sweating responses, while merely swishing it in the mouth did not.
So the cosy feeling is not imaginary, but neither is a mug a portable furnace. In this experiment, hot water changed how cold people felt and how strongly they shivered without producing a detectable difference in core temperature. The effect was also brief, studied in only ten young men and created with a laboratory cooling suit. It should not be stretched into a promise that one drink prevents hypothermia outdoors.
Real winter safety still belongs to the larger system: shelter from wind, dry insulating layers, regular breaks from exposure and prompt attention to cold-illness symptoms. Health Canada includes warm, sweet liquids among its cold-weather measures and warns against alcohol, which can increase heat loss to the extremities. A warm drink can be one useful part of the plan; it is not a substitute for getting dry, getting sheltered or getting medical help when someone is confused, unusually drowsy or otherwise showing signs of hypothermia.
For the kitchen, the honest takeaway is pleasantly modest. Hot tea, vegan cocoa or broth can provide fluid, comfort and a rapid sense of warmth. The body may respond to the drink's temperature before a thermometer can show a change, which helps explain why that first sip feels so convincing. Enjoy the mug for the job it actually does well: making a cold moment feel friendlier while the coat, dry socks and warm room handle the heavy lifting.
The next time someone says a hot drink warms you from the inside, the best answer is not simply yes or no. It can warm the experience from the inside—quickly enough to change sensation and shivering—but the leap from feeling warmer to being safely rewarmed is much larger than a teacup.
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