4. Milk and dairy products
Consuming dairy has a very positive effect on people’s mental state, as a study conducted at Binghamton University (USA) has shown. In the specific case of milk of animal origin, it contains tryptophan, an amino acid that is especially relevant in the synthesis of serotonin, as well as being especially used to treat depression or various sleep disorders. In addition, milk is also an important source of vitamin D – whose deficit is related to depression – or of essential acids such as phenylalanine, used in medicine to increase the level of endorphins or as a natural analgesic that decreases pain.