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In line with previous studies, a new study finds taking one fish oil capsule every day can prevent mental illnesses in the at-risk population.

Previous studies had reported that omega 3 in fish oil is heart tonic and can fight dementia.

According to the study published in the Archives of General Psychiatry, taking fish oil supplements lowers the risk of developing psychotic disorders such as schizophrenia by one quarter in individuals with weak or transient psychotic symptoms as well as those with schizophrenia-like brain changes.

Omega-3 fatty acids found in fish oil are believed to fight psychosis through altering the brain signaling process, the study found.

"The finding that treatment with a natural substance may prevent, or at least delay, the onset of psychotic disorder gives hope that there may be alternatives to antipsychotic drugs," said lead researcher Paul Amminger.

Scientists concluded that regularly taking supplements is as effective as antipsychotic drugs but associated with fewer side effects. They, therefore, hope the supplement will soon substitute the current therapeutic regimens.