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While certain diets or foods may not ease depression (or put you instantly in a better mood), they may help as part of an overall treatment plan. There's more and more research indicating that, in some ways, diet may influence mood. We don't have the whole story yet, but there are some interesting clues.
Mood changes during pregnancy can be caused by physical stresses, fatigue, changes in your metabolism, or by the hormones estrogen and progesterone. Significant changes in your hormone levels can affect your level of neurotransmitters, which are brain chemicals that regulate mood. Mood swings are mostly experienced during the first trimester between 6 to 10 weeks and then again in the third trimester as your body prepares for birth.