Water can also briefly boost the body's resting energy expenditure, or the quantity of calories expended when resting. Drinking cold water may increase the calorie-burning effects of water since the body expends energy, or calories, heating the water for digestion. However, this effect is only temporary—by the time you reach 100 degrees Fahrenheit, your body has already used up all its energy savings.
Studies have shown that individuals who drink cold water before a meal tend to eat less than those who drink warm water. This may be because cold water reduces appetite by causing receptors in the brain to release serotonin, which makes you feel full.
However, other studies have found that drinking cold water has no effect on appetite at all or even increases appetite. So while it may be effective at reducing food consumption if you drink cold water before a meal, it could also be worse for your waistline if you drink cold water as a weight loss strategy. It's important to note that most people will digest hot water better so it's more likely to cause you to feel full if you drink it first thing in the morning.
People who struggle with their weight should not try to reduce their intake of fluids overnight. Instead, focus on adding more water-rich foods into your diet, such as fruits and vegetables. This will help you get the nutrients you need without weighing you down with extra fluid.
Cold water may help you burn a few additional calories while you digest it since your body needs to work harder to keep its core temperature stable. Drinking cold water, on the other hand, is unlikely to be an effective weight-loss booster. Research published in Obesity found that even after accounting for differences in calorie consumption and physical activity levels, people who drink cold water appear to gain more weight over time.
The study included data from 14,818 participants of European descent in 10 countries (Germany, Italy, Netherlands, Norway, Spain, Sweden, Switzerland, United Kingdom, Australia). Each participant was asked how often they drank cold water and what size their glass was. They were also asked to report their current weight and height so researchers could calculate their body mass index (BMI). On average, participants drank 1.5 glasses of cold water per day and their sizes ranged from 150 ml to 600 ml. After two years, those who drank cold water every day had increased their BMI by 0.4 compared with those who didn't consume cold water at all.
Drinking cold water can help reduce your appetite by making you feel full longer. This effect is probably due to changes occurring in the brain when it comes into contact with cold liquids. The sensation of feeling full then causes you to stop eating before you actually become full.
The belief that drinking cold water boosts the number of calories you burn is a fallacy, but it is true that cold water lowers your body temperature to the point where the body must act. Swimming in cold water puts physical and emotional strain on the body. The human body was not designed to function at such low temperatures; any damage caused by being immersed in cold water is done so because of this strain rather than due to some metabolic change.
The fact is that drinking cold water does not cause you to use more energy nor does it make you more active. What does happen is that being submerged in cold water makes you feel tired later on. Human bodies are not used to functioning at such low temperatures so by forcing your body into such an environment you can see why some people become ill or even die.
It is important to remember that people who drink cold water to help with weight loss usually do so because it feels good when you're hot under the collar! Drinking ice-cold liquids is very satisfying and can make you think you're consuming less than other people, but it's not really reducing your overall calorie intake.
The best way to lose weight is through a healthy diet and exercise. If you choose to drink cold water as part of your weight loss plan, then do so in moderation. Eating small, frequent meals helps the body use the calories consumed; eating large meals late at night leads to fat storage.