Here's something that might surprise you: scientists at Cornell University have found evidence that drinking water during meals might actually make you eat more, not less. It's a finding that flies in the face of a diet tip you've probably heard your whole life — drink water before or during meals to feel fuller and eat less. But according to researcher Paige Cunningham, the stomach empties water so quickly that any fullness probably doesn't last. The study was published in the journal Appetite.
Cunningham, an assistant professor in the Division of Nutritional Sciences at Cornell, worked with John Hayes from Penn State to look at how people actually eat, not just how we're told they should. In one experiment, 86 adults were video-recorded eating as much beef chili or chicken tikka masala as they wanted, with water available. The researchers counted every bite and every sip.
What they found went against common advice. For every additional 100 grams of water participants drank, they ate about 39 more grams of food — roughly 49 extra calories. But here's where it gets really interesting. People who switched back and forth between bites of food and sips of water ate even more. Each time they switched, they consumed about 4.4 extra grams of food. The researchers think this happens because alternating food and water keeps the meal feeling fresh and appealing longer, so people don't naturally stop as early.
The study did find one surprise: people who drank water faster actually ate less. But the researchers say they're not sure why yet — it might be related to how long the meal lasts overall.
In a second experiment, the team looked at something completely different: spice. Forty-nine adults munched tortilla chips with either a mild or spicy salsa for two weeks. The only difference between conditions was how much cayenne pepper (the stuff that makes salsa hot) was in the salsa. The results were striking — the spicier version cut total snack intake by 28%, even though the chips themselves didn't change at all. Participants ate the spicy snack about 30% more slowly. Heat made people slow down, and slower eating meant less food overall.
So what does this mean for you? Cunningham is careful to say these were observational studies — they show patterns but can't prove cause and effect yet. She and her team are now running follow-up studies to dig deeper. But the early findings suggest that some of the advice we accept as common sense around food might be worth questioning. Adding a little spice to your meals could naturally help you eat less without counting calories or feeling deprived. And if you're watching your portions, washing food down with water bite by bite might be working against you.