Drinking Water With Meals Linked to Higher Food Intake

Key Points Summary

• • A new Appetite study found that higher water intake during meals was associated with greater food and calorie consumption, not less.
  • Frequently alternating bites of food with sips of water was also linked to increased food intake.
  • Faster drinking rates were unexpectedly associated with lower food intake, though researchers caution against causal interpretation.
  • Water intake did not reduce the appetite-lowering effect of spicy meals.
  • Researchers emphasize these findings are observational and should not change clinical recommendations without further randomized studies.
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Drinking Water With Meals May Increase Food Intake, Study Finds

For years, drinking water with meals has been promoted as a simple strategy to promote fullness and reduce calorie intake. However, new research published in Appetite suggests the relationship between mealtime hydration and eating behavior may be more complex than previously thought. Researchers found that greater water consumption during meals was associated with higher food and energy intake, challenging a widely accepted dietary recommendation.

The findings also showed that people who alternated more frequently between bites of food and sips of water tended to consume larger meals. While these observations raise important questions about eating behavior, the investigators stress that the study demonstrates associations rather than cause-and-effect relationships.

Does Drinking Water With Meals Reduce Food Intake?

Researchers conducted a secondary analysis of two randomized crossover studies involving 86 adults who consumed mild and spicy versions of beef chili or chicken tikka masala. Participants were served meals with water available ad libitum while their eating and drinking behaviors were video recorded.

Across 172 meals, participants drank an average of 236 g of water and switched between bites and sips approximately 8.5 times per meal.

Key Findings for Healthcare Professionals

• Every additional 100 g of water consumed was associated with approximately 39 g more food and 49 additional calories.
• Participants who switched more frequently between eating and drinking consumed significantly larger meals.
• Faster drinking rates correlated with lower food intake, although researchers believe this may reflect meal duration rather than drinking speed.
• Increasing meal spiciness slowed eating and reduced food intake, but water intake did not diminish this effect.

These findings suggest that water intake and food consumption may be linked through behavioral factors rather than stomach fullness alone.

What Could Explain the Findings?

Researchers proposed several possible mechanisms. Water may reduce oral sensations linked to thirst that normally suppress eating, allowing individuals to continue consuming food. It may also lubricate food, making swallowing easier and extending meal duration.

Another hypothesis is that alternating between food and water creates changing sensory experiences in the mouth, potentially delaying sensory-specific satiety. However, the study did not directly measure these biological processes, making these explanations speculative.

Importantly, participants who drank more water reported feeling fuller after meals, even though they also consumed more food.

Clinical Takeaways and Future Research

Although these results question the assumption that mealtime water consumption consistently limits calorie intake, they should not be interpreted as evidence that drinking water during meals causes overeating. The study evaluated moist, laboratory-prepared meals in a relatively small and homogeneous population, limiting generalizability.

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For physicians, dietitians, nurses, and obesity specialists, the findings highlight the importance of considering eating behaviors, including drinking patterns, alongside nutritional recommendations. Future randomized trials are needed to determine whether modifying water intake or bite-to-sip switching can meaningfully influence appetite regulation and weight management.

Source:

Sciencedirect