Leena Watts
Drinking water is often associated with weight loss. Substituting water for high-calorie beverages could lead to long-term weight loss. Water is calorie-free and may help burn more calories by increasing sympathetic activity. A 2021 study found that drinking only water for 5 days resulted in a loss of nearly 5 kg of weight. However, without medical supervision, water fasts are not safe and can lead to life-threatening complications. While there is no one-size-fits-all answer, most people need about four to six cups of water each day, with men requiring more than women.
Should you drink a lot of water when dieting?
| Characteristics | Values |
|---|---|
| Recommended daily water intake | 4-6 cups of plain water |
| Individual factors influencing intake | Health conditions, medications, activity level, ambient temperature, and intake of other beverages and water-rich foods |
| Dehydration warning signs | Dark yellow urine, weakness, low blood pressure, dizziness, or confusion |
| Water fasting | Not safe or recommended without medical supervision due to potential life-threatening complications |
| Weight loss benefits of drinking water | May increase satiety, reduce hunger, and help curb unnecessary snacking; may help burn more calories in people with metabolic problems or obesity |
| Recommended amount | Academy of Nutrition and Dietetics recommends 9 cups for females and 13 cups for males, in addition to water from food |
| Hydration alternatives | Lower-fat milk, herbal tea, and sugar-free drinks like tea and coffee |
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What You'll Learn
Drinking water before meals may reduce appetite
Drinking water is often recommended as a weight-loss strategy. Substituting water for high-calorie beverages can lead to long-term weight loss. Drinking water before meals may help with weight loss by reducing appetite and making people feel fuller, causing them to eat less.
Some older studies have found that drinking water before meals may reduce appetite and lead to eating less. One study found that older participants who drank a full glass of water before meals tended to eat less than those who didn't. Another study found that people on a low-calorie diet who drank extra water before meals had less appetite and more weight loss over 12 weeks than those on a similar diet without the extra water.
However, the impact of drinking water before meals on long-term weight loss is unclear. More recent studies have found no evidence that drinking water before meals helps burn calories. Additionally, drinking water with meals can result in a higher glucose spike, which can lead to a crash later.
While drinking water before meals may not be a significant calorie-burning strategy, it can still contribute to a reduced calorie intake by making people feel fuller and reducing their appetite. This may be due to the stomach's nerves sensing stretch and sending signals to the brain that it's time to stop eating.
It's important to note that water consumption should not replace eating and that drinking water should be complemented with other weight-loss strategies for effective results.
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Water is calorie-free
Water is a calorie-free beverage that can help reduce overall calorie intake when substituted for other beverages, which may be high in calories and sugar. This simple substitution can lead to long-term weight loss. For instance, in a 2015 study, female participants who drank water after lunch each day while attending a 24-week weight loss program lost 13.6% more weight than those who drank the same volume of diet beverages.
Drinking water is especially beneficial for weight loss when consumed before meals, as it can help reduce appetite and make you feel fuller faster. This is because the stomach has nerves that sense stretch and send signals to the brain that it's time to stop eating. However, it is important to note that this effect has only been observed in people of average weight and body mass index (BMI).
While drinking water is a healthy and calorie-free option, it is essential to be mindful of your total fluid intake. Water intake is individualized, and factors such as health conditions, medications, activity level, and ambient temperature can influence how much water you need. As a general guideline, aim for four to six cups of plain water each day, but listen to your body and adjust your intake as needed.
In addition to its weight loss benefits, water plays a crucial role in keeping every system in the body functioning properly. It is essential for digestion, muscle function, and maintaining hydration, which is critical for overall health.
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Water may help burn more calories
Secondly, drinking water before meals may help reduce appetite and calorie intake. The stomach has nerves that sense stretch and signal to the brain when to stop eating. Filling up on water before a meal can therefore make you feel fuller and eat less. Several studies have supported this idea, although they were short-term and did not assess the impact on long-term weight loss.
Thirdly, the water we drink must be heated to body temperature, which requires the body to expend energy. This process is called thermogenesis and could offset some calories from meals. However, more recent studies have found no evidence that drinking water burned off many calories.
Finally, replacing high-calorie drinks with water can dramatically reduce calorie intake, which can lead to weight loss. Water is calorie-free, so choosing it over sugary drinks is a simple way to cut down on sugar and calories.
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Replacing sugary drinks with water may aid weight loss
Water is essential for overall health and weight loss. Drinking water can prevent dehydration, which may cause unclear thinking, mood changes, overheating, constipation, and kidney stones. Water has no calories, so replacing sugary drinks with plain water can help reduce caloric intake. Water also helps to flush toxins, keeps you feeling full, and aids digestion.
A study conducted by UNC–Chapel Hill, North Carolina, found that substituting non-caloric beverages (water or diet beverages) for caloric beverages (≥200 kcal/d) resulted in a significant reduction in weight and waist circumference. The results showed a mean weight loss of -2.03 ± 0.40% in the water group, which was slightly higher than the -1.76 ± 0.35% weight loss in the dietary changes group.
Observational evidence also suggests that drinking water is associated with weight loss and a reduction in caloric intake. For example, a study by Van Walleghen et al. found that pre-meal water consumption reduced meal energy intake in older adults. Additionally, lemon water can aid in hydration and digestion, as well as stimulate detoxification and improve nutrient absorption.
Other drinks that can aid in weight loss include herbal teas, green tea, and coconut water. These drinks can boost metabolism, suppress appetite, and improve digestion. However, it is important to note that water should not be your only source of hydration. All beverages containing water contribute to your daily needs, and some people tout the benefits of milk for hydration as well.
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Water is not the only way to stay hydrated
While drinking water is essential for maintaining proper bodily function, it is not the only way to stay hydrated. Water intake varies from person to person, and other factors such as health conditions, medications, activity levels, and ambient temperature influence total daily water intake.
Fruits and vegetables are excellent alternatives to water, as they are packed with electrolytes and essential nutrients. For instance, cucumbers are 96% water and contain no saturated fat or cholesterol. They are also rich in vitamin K, vitamin B6, and iron. Similarly, strawberries are 92% water and loaded with fiber and vitamin C. Other water-rich foods include salads, applesauce, and celery, which is about 95% water and high in potassium and vitamin K.
In addition to water-rich foods, certain beverages can also contribute to hydration. Milk, for example, is an excellent source of calcium and has been shown to be better than water for rehydration and recovery after exercise. Skim or fat-free milk is recommended, as the fat in whole milk can delay fluid replacement. Smoothies are another great option, allowing you to combine multiple hydrating and nutritious ingredients into one delicious drink.
Other drinks that can contribute to hydration include coconut water, which is low in carbohydrates and rich in potassium, making it a good option for rehydrating after light exercise. Coffee has also been found to contribute to daily water intake and can provide additional health benefits, such as improved memory and reduced risk of ailments like diabetes and heart disease. Sports drinks, while containing sugar and sodium, can also be effective in rehydrating and replenishing electrolytes after intense or prolonged workouts.
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Frequently asked questions
Most people need about four to six cups of plain water each day. However, water intake is an individualized number and depends on factors such as health conditions, medications, activity level, and ambient temperature.
Drinking water can help with weight loss. Water has zero calories, so choosing water over high-calorie drinks may help reduce calorie consumption. Drinking water before meals may also help reduce appetite and make you feel less hungry.
Yes, a 2015 study found that female participants who drank 250ml of water after lunch each day lost 13.6% more weight than those who drank the same volume of diet beverages. Another study from 2014 found that drinking 500ml of water before meals for 8 weeks resulted in weight loss and appetite suppression.
Water fasting, or drinking only water and eating no food, can lead to adverse effects on the body and should only be done under medical supervision. Without medical supervision, water fasting can lead to life-threatening complications such as low sodium and brain swelling.
Yes, if you don't like the taste of plain water, you can try sparkling water or add a slice of lemon or lime. Sugar-free drinks, lower-fat milk, tea, and coffee also count towards your fluid intake. However, be mindful of your caffeine intake and limit sugary drinks.
