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Even though science has vaguely explained this phenomenon, one thing is certain: our diet influences our mood. This is what another team of researchers found out with their experiment. Fat cells put us in a good mood. In one experiment, test persons were either given a saline solution or fatty acids through a tube directly into the stomach. Then they heard neutral or sad music and saw images of neutral or sad faces. Those who had the saline solution in their stomach were in a bad mood. The fat cells, on the other hand, brought the tested persons into a good mood, at least for a time. The scientists are still more or less unresolved about the purpose of the intestine determining the mood. But there are attempts of explanations for this that sound logical.