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The viral wellness trend asks a simple question – is warm or cold water healthier? – but the science behind it is very different.
Previous research shows that the temperature of food and drink has a measurable effect on things like anxiety and gastrointestinal discomfort.
One of the long-standing health claims is that ice cold water improves calorie burning by forcing the body to burn them. Although this is based on science, the actual effect may be small.
Finally, experts say, the health impact of water heating depends on the goal – weight loss, sports performance, digestion or comfort.
Does cold water promote weight loss?
“According to the study, 90 minutes after consuming cold water or room temperature, energy consumption increased slightly by 2.9% (cold water) and 2.3% (room temperature),” Tanya Freirich, a registered dietitian and diabetic in North Carolina, told Fox News Digital.
Extra water may suppress appetite or contribute to energy production and expenditure, experts say. (Stock)
Although the body expends energy to warm the cold water, Freirich noted that it is “not important enough to make it useful” for weight loss. Hot water doesn’t dissolve fat, however, he added.
For those looking to lose or manage weight, Freirich suggests focusing on “how much” rather than “how cold.” He cited a study involving obese women who added 1.5 liters of water to their daily intake. In eight weeks, participants saw measurable weight loss.
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“Extra water may suppress appetite or contribute to energy production and expenditure,” says Freirich. The temperature of drinking water should not affect the way the body uses nutrients, he added, noting that more research is needed.
For those exercising in hot and humid conditions, the goal should be to rehydrate without losing too much fluid through sweat. Research on thermoregulation suggests that there is an ideal water temperature for athletes.
The temperature of drinking water should not affect the way the body uses nutrients, according to experts. (Stock)
Although drinking water can cause sweating as the body regulates its temperature, 60.8 degrees Fahrenheit is associated with the least amount of sweating.
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“It’s cool, but not cold,” stressed Freirich. Drinking water in this particular range helps the body to rehydrate properly without causing stress to the intestines.
Warm water and digestion
There are several reasons a person might choose warm water, including its effect on relaxation and digestion. Studies have found that warm liquids can accelerate gastric emptying, effectively stimulating the bowels.
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The benefits may be psychological as well. Freirich points to research showing that hot black tea leads to lower levels of cortisol – the main stress hormone – and greater independent relaxation after stressful activities.
The popularity of warm water is often attributed to its effect on digestion and absorption. Studies have found that warm liquids can accelerate gastric emptying, effectively stimulating the bowels. (Stock)
Medical causes
Freirich warns that very cold water can cause difficulty for those with difficulty swallowing, or it can cause headaches and “brain fog” for people with sensitive nerves.
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In addition, those with irritable bowel syndrome (IBS) may find that cold drinks cause digestive discomfort.
Ultimately, the best temperature is the one that encourages people to drink, says the nutritionist. The general recommendation for adults is to drink seven to eight glasses of water a day.
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“Most importantly, it’s important for everyone to stay hydrated,” Freirich said.
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