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How Water Intake Affects Metabolism & Weight Loss
Written by John Joseph Ojendras
Best fitness apps for ladies in USA at 2026 | February 6, 2026
Table of Contents
On the other hand, endurance athletes or highly active people could potentially benefit from electrolyte beverages or supplements, as they lose far more electrolytes via sweat. Additionally, ketogenic diets have a diuretic effect that contributes to electrolyte loss via urine, and it’s important for anyone on these diets to prioritize adequate water and electrolyte intake and pay attention to how they feel. The study by Madjd and colleagues provides key data regarding the impact of water, as opposed to diet beverages, on body weight and metabolic parameters. It appears, however, that persuading adolescents to increase their water intake is a major challenge. Further studies will be needed to examine the impact of water intake on weight loss.
Thirst is the desire to drink, and is not only driven by physiological cues but behavioral cues. An example of a behavioral prompt is water temperature; research suggests that people tend to drink the most water when it is served at room temperature even though cooler drinks are rated as most pleasing to taste. We are also often influenced to drink (and eat) more in social settings.
Warm Water in the Morning: Is It Healthier? Myths & Facts About Warm Water

Part of your daily water intake also comes from the foods you eat. Fresh fruits and vegetables have a higher water content, which helps you stay hydrated. Keep in mind that temporary weight loss may result from most liquid-based fasts and cleanses, including water fasting. But there is little to no scientific evidence of long-term weight loss on this type of eating plan. And, while temporary weight loss may be the only potential “pro” to doing a water fast, the “con” list is very long. Kidney damage, nutritional deficiencies, fainting, brain fog, fatigue, and, in women, hormone level alterations, Do says.
Myth or Fact? Warm Water Helps Digestion
Also, the matcha is quadruple toxin-screened, so you can feel confident in the safety. And if you don’t for any reason, you can return in 90 days for a full refund. Even slight dehydration can make you feel fatigued, unimeal review and workouts will feel harder than they should. Water helps your muscles function properly, supports circulation, and regulates your body temperature. These will all contribute to better physical performance and recovery.
Wondering if Your Diet is Best for Keeping You Healthy?
The good news is that you can foster a healthier gut by integrating simple habits into your routine, such as eating diverse whole foods foods, staying well-hydrated, and getting regular physical activity. Gut hydration is needed for better weight control as drinking proper amounts of water each day aids digestion, helps to keep you feeling full between meals, and can reduce overall daily food intake. While your gut’s colonization began shortly after birth, it was influenced by factors like early feeding (breast milk or formula), but it doesn’t stop there. In fact, a glass of water before a meal may reduce your calorie consumption and studies have shown the importance of hydration for sustainable weight management.
This could suggest that either inhibition of the renin–angiotensin system unblocks fat metabolizing mechanisms, or that the increased water intake per se allows cells to hydrate better and thus regulate fat metabolism better. They were also more likely to develop a chronic disease like diabetes or heart failure. A hormone secreted by the brain called vasopressin stores fat and may trigger obesity and other ailments.
A Cochrane review found that commonly used indicators of dehydration in older adults (e.g., urine color and volume, feeling thirsty) are not effective and should not be solely used. Certain conditions that impair mental ability and cognition, such as a stroke or dementia, can also impair thirst. People may also voluntarily limit drinking due to incontinence or difficulty getting to a bathroom. A healthy body is designed to send thirst signals when the body becomes depleted of fluids.
Myth or Fact? Warm Water Improves Circulation
- It can temporarily tone down the raw, scratchy feeling and make swallowing easier, which is enormous if you’re suffering from major throat pain.
- In another recent study, Wong et al (2017) examined whether giving advice on water intake had beneficial effects on body weight in adolescents.
- Water helps everything move through your digestive system, so it’s reasonable to assume drinking more water would help prevent constipation — one of the major causes of belly bulges and bloating.
- There is promising evidence that increased water intake is beneficial for weight loss.
- Leah Groth is a Philadelphia-based writer and editor specializing in health, wellness, and lifestyle.
- Milk and oral rehydration solution did best in terms of hydration potential in this one study.
Staying hydrated is important for metabolic health, but be mindful about how much you’re tipping back when you’re eating a meal or snack. Preliminary research suggests that pairing a big glass of water with a meal, particularly one containing carb-rich foods, may exacerbate post-meal blood sugar spikes. On the other hand, spacing significant water intake from meals by about 30 minutes may promote metabolic benefits. The National Academy of Medicine suggests an adequate intake of daily fluids of about 13 cups and 9 cups for healthy men and women, respectively, with 1 cup equaling 8 ounces. Higher amounts may be needed for those who are physically active or exposed to very warm climates. Lower amounts may be needed for those with smaller body sizes (the chart below lists daily water intake based on age group from the National Academy of Medicine).
What Does Science Say About Hydration and Weight Loss?
One small study found that drinking water before meals helped naturally reduce calorie intake, which may in turn support healthy weight management. When subjects drank one and a quarter cups of water prior to a meal, they ate less compared with the groups who drank the same amount after a meal or drank nothing at all. This study involved only 15 participants, all of whom were between ages 20 and 30, so larger, more diverse studies are needed. The findings showed that compared to plain water, oral rehydration solution (a version of electrolyte water with a small amount of glucose), orange juice, and milk were above-average hydration beverages.
Supports Your Metabolism

Hydration affects hormones like insulin and cortisol, both of which influence fat storage. Dehydration can lead to blood sugar fluctuations and increased stress hormone levels, which may contribute to weight gain, especially around the midsection. But it’s not like there aren’t benefits to drinking warm or hot water.
How to Get the Weight Loss Benefits of Ephedra Without the Risks
Yes, watch my Evidence-Based Weight Loss lecture to see how you can add the benefit of negative-calorie preloading by drinking that water right before your meals. When we eat, our body https://unimeal.reviews/ shifts blood flow to our digestive tract, in part by releasing noradrenaline to pull in blood from our limbs. So, drinking water was thought to be a zero-calorie way of stretching our stomachs. But, instead, if we drink two cups (480 mL) of saline (basically salt water), the metabolic boost vanishes, so stomach expansion can’t explain the water effect. The idea that drinking warm or hot water in the morning, or at any time, is better or worse than cold water is much more myth than fact.
Risks of dehydration
Both of these appear to be due to activation of the sympathetic nervous system – the “fight or flight” response. As for when you should drink water to maximize weight loss, prior to meals may help decrease your appetite and prevent overeating. And, because water can help with digestion, consider drinking some after a meal. In general, though, Sass recommends spreading your water intake throughout the day.
🤓 Study #3: Multiple mechanisms by which water intake supports weight loss
“Water weight can also be retained due to hormonal shifts,” she adds. If the water weight is due to excess sodium, ironically, “the best way to lose it is to drink more water, and up your intake of potassium, which triggers the release of excess sodium and fluid,” she explains. Potassium-rich foods include potatoes and sweet potatoes, bananas, avocados, and leafy greens like spinach, per the Cleveland Clinic. “If your body can’t dump excess heat via sweating, you’re setting yourself up for heat exhaustion or worse,” she says. It almost goes without saying, but if you’re always grabbing a snack when what your body actually needs is water, you might find yourself on a path to weight gain instead of loss.
