Can food really affect my mental health?

Many people are seeking to take control of their mental health using self-help, and to find approaches they can use alongside, or even instead of, prescribed medication. One self-help strategy is to make changes to what we eat, and there is a growing interest in how food and nutrition can affect emotional and mental health.

Scientific evidence to back this up is developing, but there are many challenges for scientists to overcome and, in the meantime, some medical practitioners remain unconvinced of the link between food and mood. Nevertheless, positive responses from individuals who have made changes to their diet confirm the importance of food and nutrition for maintaining or improving their emotional and mental health. For example, a national survey of 200 people looked, in detail, at the sorts of changes some people have been making, and the benefits they are experiencing. Information about this survey is available from the Food and Mood Project.

In addition to self-help, experienced healthcare professionals may support individuals in making dietary changes, and recommend appropriate nutritional supplementation. The real effects of food on mood demonstrate how it can form part of a more holistic approach to the treatment of mental distress.

How does food affect mood?

There are many explanations for the cause-and-effect relationship between food and mood. The following are some examples:

  • Fluctuations in blood sugar levels are associated with changes in mood and energy, and are affected by what we eat.
  • Brain chemicals (neurotransmitters, such as serotonin, dopamine and acetylcholine) influence the way we think, feel and behave. They can be affected by what we’ve eaten.
  • There can be abnormal reactions to artificial chemicals in foods, such as artificial colourings and flavourings.
  • There are reactions that can be due to the deficiency of an enzyme needed to digest a food. Lactase, for instance, is needed to digest lactose (milk sugar). Without it, a milk intolerance can build up.
  • People can become hypersensitive to foods. This can cause what are known as delayed or hidden food allergies or sensitivities.
  • Low levels of vitamins, minerals and essential fatty acids can affect mental health, with some symptoms associated with particular nutritional deficiencies. For example, links have been demonstrated between low levels of certain B-vitamins and symptoms of schizophrenia, low levels of the mineral zinc and eating disorders, and low levels of omega-3 oils and depression.
  • A build-up of toxins from the environment, such as lead from traffic pollution or mercury from leaky amalgam fillings, can also affect the proper functioning of the body and brain.