Can food really affect my mental health?


By Susan Furtado, Registered Holistic Nutritionist

Many people are seeking to improve their mental health by using self-help strategies, and by finding approaches that 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. There have been positive responses from individuals who have made changes to their diet which confirm the importance of food and nutrition for maintaining or improving emotional and mental health.

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 health concerns.

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.
  • What we eat can affect brain chemicals (neurotransmitters, such as serotonin, dopamine and acetylcholine) which influence the way we think, feel and behave
  • 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
  • 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.

What’s the psychological relationship between food and mental health?

It’s generally accepted that how we feel can influence what we choose to eat or drink (mood to food). What is less well-known is how what we eat can affect our mental functioning (food to mood). The use of caffeine is one example of what is a complex relationship. Caffeine, found in tea, coffee, cola drinks and chocolate, is probably the most widely used behaviour-modifying drug in the world. We often choose to drink it if we are feeling tired and irritable, because it can give us a boost and help us to concentrate. Having a cup of coffee or tea also has a lot of positive psychological associations. We meet a friend for ‘coffee and a chat’ or give ourselves a break by sitting down with a cup of tea, and these things are very important. But too much caffeine (which is a different amount for

each of us) can cause symptoms, such as anxiety, nervousness and depression. Any exploration into food and mood needs to take into account this two-way relationship and include the psychological aspect behind what we are choosing to eat.

How do I find out if food is affecting my  mental health?

Before investigating the specific foods that could be affecting your mental and emotional health, it’s well worth having a look at what you are already eating and drinking. Usually, the most reliable way of doing this is to keep a food and drink diary every day, for about one week. It seems to work best if you can write down what you eat and drink, at the time you have it. The more information you include in your diary, the more useful it is likely to be; for example, you could also note down the time and the approximate amounts you consume. People are often surprised when they look back over what they have eaten. Greater awareness is an important first step forward.

What should I look for in my diet?

A fundamental thing for you to consider will be: is there any one food or type of food that I eat nearly every day or in particularly large amounts? The basis of a healthy diet is about achieving a balance between a wide variety of foods, where the variety is spread out over a number of days. Certain foods are eaten on most days, by most people, perhaps because they are generally considered healthy to eat. Unfortunately, these can be the very foods that are having a disguised, yet disabling, influence upon your health.

It’s often a combination of eating too much of some foods and not enough of others that is contributing to symptoms such as depression or anxiety. An essential part of making changes to your diet involves making sure you are not going without the nutrients your body requires on a daily basis. So, if you cut down on one food, you will usually need to substitute something similar to eat, instead. This may mean, for example, replacing wheat-based bread with bread made from rye flour.

Which foods affect which moods?

Although the precise cause-and-effect relationship between different foods and moods has yet to be fully understood, many people have found they can link eating (or not eating) certain foods with how they feel. The foods and drinks that most often cause problems are those containing alcohol, sugar, caffeine, chocolate, wheat (such as bread, biscuits, and cakes), dairy products (such as cheese), certain artificial additives and hydrogenated fats. Other commonly eaten foods, such as yeast, corn, eggs, oranges, soya and tomatoes, may also cause symptoms for some people.

Significant improvement to a wide range of mental health problems can result from making changes to what we eat. There have been reports of improvements in the following: mood swings, anxiety, panic attacks, cravings or food ‘addictions’, depression (including postnatal depression), irritable or aggressive feelings, concentration, memory difficulties, premenstrual syndrome (PMS), obsessive-compulsive feelings, eating disorders, psychotic episodes, insomnia, fatigue, behavioural and learning disorders, and seasonal affective disorder (SAD).

Which foods do I need to eat in order to feel well?

The most vital substance for a healthy mind and body is water. It’s easy to overlook drinking the recommended six to eight glasses, per day, which is a low-cost, convenient, self-help measure that can quickly change how we feel, mentally as well as physically. Having a minimum of five portions, daily, of fresh fruit and vegetables (organically grown, if possible) provides the nutrients needed to nourish mind and body.It’s best not to skip breakfast, to keep regular meal times, and to choose foods that release energy slowly, such as oats and unrefined wholegrains. It’s also important to eat some protein foods, such as meat, fish, beans, eggs, cheese, nuts or seeds, every day. As well as providing nutrients, these eating strategies help smooth the negative effects of fluctuating blood sugar levels, which include irritability, poor concentration, fatigue, depression and food cravings. Essential fatty acids, particularly the omega-3 type found in oil-rich fish, such as mackerel and sardines, linseeds (flax), hemp seeds and their oils, are vital for th for ation and healthy functioning of the brain. Other seeds and nuts, such as sunflower seeds, pumpkin seeds, brazil nuts and walnuts, also contain important ‘good mood’ nutrients.

How can I go about changing my diet?

It’s probably a lot easier if you start by making changes slowly, one at a time, and just for a trial period. Changing what you eat takes a bit of effort and time; trying out new and different foods may mean you need to shop in new places. Hopefully, you will enjoy making these changes and find them to be a positive experience. Smaller changes, introduced one at a time, are easier to manage and keep up, should you find them beneficial. If you make more than one change at a time, then you won’t be able to tell what is having an effect. Some changes may even be unnecessary, although you won’t know until you try. This step-by-step approach can be broadened out later, and keeping a food and mood diary may be helpful.

Sometimes, a change to the diet produces some unpleasant side effects, for the first few days only. If people suddenly stop drinking coffee, for instance, they may get withdrawal symptoms, such as headaches, which then begin to clear up after a few days, when they start to feel much better. Symptoms such as these can be reduced if you cut down gradually, rather as if you were weaning yourself from a drug. There are, necessarily, some costs associated with making changes to what you eat, but these can be rewarded by significant benefits to mental and physical health.

If you are interested in booking an appointment for nutri-therapy with Susan Furtado, you can contact her at


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