Is it true that drinking water helps with weight loss?

Yes, drinking water can support weight-loss efforts, but its effects are modest and primarily indirect. The strongest evidence comes from two key mechanisms: substituting water for sugary drinks (reducing calorie intake) and consuming water before meals (promoting fullness and reducing meal-time calorie consumption). Studies, such as the 2013 Huggins et al. trial involving overweight girls, show that pre-meal water intake can lead to modest weight loss over weeks, even without other dietary changes. Similarly, meta-analyses (e.g., Healthline 2019) confirm that replacing high-calorie beverages with water contributes to weight loss, though most benefit stems from calorie reduction rather than water itself.

Water also has minor metabolic benefits, such as a slight increase in energy expenditure due to thermogenesis (10–30 calories after drinking cold water) and supporting fat metabolism. However, these effects are negligible compared to behavioral changes like calorie substitution.

Practical recommendations include:

• ·Swap sugary drinks for water (or unsweetened alternatives).
• ·Drink ~250 mL (1 cup) 30 minutes before meals to curb appetite.
• ·Meet baseline hydration needs (2.7 L/day for women, 3.7 L/day for men, including food sources).

While water aids weight loss indirectly, it’s most effective as part of a broader plan involving diet and exercise. Overhydration risks (e.g., hyponatremia) are rare with typical intake.