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For example, a meta-analysis show that the effect size for the effects of tryptophan depletion on mood in depressed people not taking antidepressants was large (Hedge's g = −1.9 (95% CIs −3.02 to −0.78) [3] Hence, a more accurate interpretation is that tryptophan depletion studies suggest a role for 5-HT in people vulnerable to depression ...
People with MDD sometimes show diurnal and seasonal variation of symptom severity, even in non-seasonal depression. Diurnal mood improvement was associated with activity of dorsal neural networks. Increased mean core temperature was also observed. One hypothesis proposed that depression was a result of a phase shift. [30]
A recent large-scale study found that severe depression in patients with bipolar disorder responds no better to a combination of antidepressant medications and mood stabilizers than it does to mood stabilizers alone and that antidepressant use does not hasten the emergence of manic symptoms in patients with bipolar disorder. [40]
The pharmacology of antidepressants is not entirely clear.. The earliest and probably most widely accepted scientific theory of antidepressant action is the monoamine hypothesis (which can be traced back to the 1950s), which states that depression is due to an imbalance (most often a deficiency) of the monoamine neurotransmitters (namely serotonin, norepinephrine and dopamine). [1]
5-HTP is produced from the amino acid tryptophan through the action of the enzyme tryptophan hydroxylase. Tryptophan hydroxylase is one of the biopterin-dependent aromatic amino acid hydroxylases. Production of 5-HTP is the rate-limiting step in 5-HT (serotonin) synthesis. 5-HTP is normally rapidly converted to 5-HT by amino acid decarboxylase. [1]
Omega-3 fatty acids It is also conjectured that omega-3 fatty acids may have a mood stabilizing effect. [16] Compared with placebo, omega-3 fatty acids appear better able to augment known mood stabilizers in reducing depressive (but perhaps not manic) symptoms of bipolar disorder; additional trials would be needed to establish the effects of omega-3 fatty acids alone.