You can also boost serotonin in your brain naturally by eating foods that are high in tryptophan (a precursor of serotonin). An easy way to do it is to mix three tablespoons of ground flax seed in juice each morning and drink it.

You can also eat high tryptophan foods such as tofu, ground flax seeds, roasted pumpkin seeds, gluten flour, sesame seeds, almonds, black walnuts, and blackeyed cowpeas.

The SSRIs prevent your brain from losing the serotonin that is already there (I believe), but the high tryptophan foods can actually help your brain produce more serotonin.