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- Both warm and cold water hydrate equally well.
- Cool water may be the best choice during exercise, in hot weather, or when dehydrated because it can help lower body temperature.
- Warm water may temporarily soothe cold symptoms and help you feel more comfortable in cold weather.
Drinking water throughout the day is essential for overall health. Water is involved in nearly every biological process in your body, and dehydration can lead to headaches, fatigue, constipation, and more. But does the temperature of the water you drink make a difference?
Does Water Temperature Matter for Overall Health?
When it comes to hydration and overall health, the temperature of the water you drink doesn’t matter.
When you ingest food or fluids, it travels through your intestinal system and is warmed or cooled to body temperature. In most cases, cold and warm water hydrate you equally well, so you can choose the fluid temperature that you like best.
Rather than focusing on the temperature of the water you drink, it’s more important to prioritize drinking enough water each day. Though water needs vary and depend on factors like body size, activity levels, and your environment, the Institute of Medicine (IOM) recommends that adult women take in 67-91 ounces ( 2–2.7 liters) of water per day and adult men take in between 84-125 ounces (2.5–3.7 liters) per day.
You can meet your water needs by drinking it or consuming water-rich foods like fruits and vegetables.
When Should You Choose Specific Temperature Water?
While the temperature of your water doesn’t matter for hydration in most cases, choosing cold or warm water may make sense in certain situations.
Cold Water Is Best During Heat Stress or Dehydration
Research suggests that cool or cold water can help lower your body temperature when you’re overheated, such as during exercise in hot weather.
A 2025 study found that drinking cool water (about 61 degrees Fahrenheit) lowered core and skin body temperatures more effectively than warm water in people exercising in hot temperatures and helped the study participants feel more comfortable in the heat.
Another study found that dehydrated participants voluntarily drank more cool water (61 degrees Fahrenheit) than ice-cold, room-temperature, or hot water. The participants drank more cool water while maintaining relatively low sweat losses, so the researchers concluded that cool water may be the best choice for rehydration after heat stress.
Hot or Warm Water May Help When You’re Sick
When you’re sick with the common cold or flu, sipping warm or hot water could temporarily soothe symptoms like a sore throat and congestion.
Some older research suggests that drinking a hot beverage may improve how open your nasal passages feel and provide temporary relief from symptoms such as a runny nose, cough, sneezing, sore throat, chills, and tiredness more effectively than the same drink served at room temperature.
Sipping on a mug of warm water or tea can also feel comforting when you’re under the weather, which may encourage you to stay hydrated and temporarily ease symptoms like headaches.
Hot or Warm Water Could Help you Warm Up
If you’re feeling cold, drinking warm or hot water may be a better choice than cold water.
Studies show that although warm drinks won’t significantly raise your body temperature, they may reduce shivering and improve comfort or physical performance in cold weather. This makes hot or warm water a better choice than cold if you’re out in the elements and want a comforting drink that may help you feel warmer and reduce shivering.
Can Drinking Cold Water Help With Weight Loss?
While drinking more water in general can help with weight loss, the temperature of your water doesn’t matter as much as some people think.
Though colder water (37 degrees Fahrenheit) has been shown to increase metabolic rate by about 4.5%, the effect is very small, short-term, and has little impact on overall calorie burning.
Since there’s no evidence that drinking cold water is more effective for weight loss than room temperature or warm water, you should choose whatever temperature helps you drink the most and stay optimally hydrated, which is key for energy balance.
Studies show that people who are dehydrated tend to have higher BMIs and are more likely to be obese compared to people who are properly hydrated. Plus, drinking more water can help you eat fewer calories, creating the calorie deficit needed to lose excess body fat.
Which Should You Choose?
While water temperature usually doesn’t matter for hydration or overall health, there are a few situations where one option may be the better choice:
- Athletes or workers in the heat: Cool or cold water may improve thermal comfort and help with temperature regulation during exercise or physical labor.
- People with swallowing disorders or esophageal conditions: Water temperature may affect comfort and ease of swallowing for people with some medical conditions, such as esophageal motility disorders.
- People with tooth or headache sensitivity: Very cold water may cause discomfort in those with sensitive teeth and trigger headaches in some.
Under certain circumstances, cold water may be a better choice than warm water and vice versa. However, if you’re healthy and just looking to support overall health and hydration, personal preference matters most. Cold and warm water both hydrate you equally well, so the best choice is the one you’ll drink consistently.
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