To feel full, think ‘treat’ when you eat

YALE (US) — People who think they’re indulging when they eat have lower levels of ghrelin, the so-called “hunger hormone,” new research shows.

Ghrelin levels typically increase before meals and decrease after meals. The higher the levels of ghrelin in the system, the more likely a person is to overeat.

A team at Yale University gave study participants a 380 calorie milkshake under the pretense that it was either a 620 calorie “indulgent” shake or a 140 calorie “sensible” shake. Those who drank what they thought was the “indulgent” high-fat, high-calorie shake had a dramatically steeper decline in ghrelin after drinking it.

Those who thought they were drinking the “sensible” low-fat, low-calorie calorie shake had a flat ghrelin response. The ghrelin response to perceived calorie counts was consistent with what would be observed had the counts actually been that high or low.

The study, which could have implications in the fight against obesity, appears online in the journal Health Psychology.

“This study shows that mindset can affect feelings of physical satiety,” says lead author Alia Crum. “The brain was tricked into either feeling full or feeling unsatisfied. That feeling depended on what people believed they were consuming, rather than what they actually were consuming.”

Because elevated ghrelin levels can cause increased body weight and fat gain through increased caloric consumption, this study may open new avenues in the fight against obesity by providing new insight into how the mind and body work together to impact responses to food.

“What was most interesting,” Crum says, “is that the results were somewhat counterintuitive. Consuming the shake thinking it was ‘indulgent’ was healthier than thinking it was ‘sensible.’ It led to a sharper reduction in ghrelin.”

Other researchers from Yale and William Corbin of Arizona State University contributed to the study, which was supported by grants from the Rudd Foundation and the Yale Center for Clinical Investigation.

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