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If you've had a bad day, you might reach for a tub of Ben and Jerry's for comfort.

But it turns out you might as well chew on a carrot stick - or eat nothing at all, the Daily Mail reports.

Comfort food may not comfort us any more than other foods - or have any more benefit than going without, a study has found.

U.S. researchers found students in a bad mood reported they felt equally cheered up after eating comfort food, other foods they did not consider comfort foods or after eating nothing.

The findings could help people trying to lose weight, or eat more healthily.

As part of the study, researchers asked 100 college students to rate their favorite comfort foods.

They then induced a bad mood in the students by making them watch clips from sad films.

They then fed half the students their favorite comfort foods, and the other half ate foods they enjoyed but wouldn't consider comfort food.

Once the students had finished eating, the researchers asked the students how they felt. It turns out all the students felt better, regardless of what they had eaten.

They repeated the same experiment except this time, half the students ate comfort food, and the other half ate nothing.

After a few minutes, both groups felt equally better and researchers said the comfort food had no effect on mood.

Writing in the report, lead researcher Traci Mann, of the University of Minnesota said: 'Although people believe that comfort foods provide them with mood benefits, comfort foods do not provide comfort beyond that of other foods (or no food).

'Individuals may be giving comfort food "credit" for mood effects that would have occurred even in the absence of the comfort food.'

Researchers admitted the study had significant limitations, one of which being that it only looked at a particular type of 'bad mood' – induced by watching sad films.

They added they didn't look at the real-life contexts in which people eat comfort foods, and said perhaps the comfort from comfort food comes from going to a cafe and acquiring it.

However they said they weren't surprised by the findings as changes in mood are psychological, with food a very weak trigger for changes.