According to Science Times, there is growing evidence that fasting can have a positive effect on mental health. According to a recent research review, this practice can improve mood and cognitive function. Additionally, abstaining from food can improve mood. Many studies have shown that it increases the production of the hormone serotonin. Fasting can also increase the production of brain-derived neurotrophic factor (BDNF), a protein necessary for the growth of neurons in the brain. Low BDNF levels have been associated with depression and other psychiatric disorders.
However, there are risks to abstaining from food. Fasting can lead to dehydration, headaches, dizziness and fatigue, as well as eating disorders that can have negative consequences on mental health.
Source: Ferra
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