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Diet and Depression
Most people are aware that a healthy diet is important to reduce the risk of heart disease, diabetes, obesity and other physical health problems.
Recent evidence also suggests that good nutrition may be just as important for our mental health and that a number of mental health conditions may be influenced by dietary factors.
There is not enough evidence to draw any firm conclusions yet about the effects of diet on mental health, but the evidence does suggest that a healthy diet protects our mental health.
While a healthy diet can help recovery, it should sit alongside other treatments recommended by your doctor.
Healthy eating on a budget:
A healthy diet can be more expensive. Fish, fruit and vegetables can be particularly pricey. However, by cutting down on sugary drinks and snacks, takeaways and alcohol, you can save money so you can buy healthier foods.
Take care to buy only as much as you know you can use within the next few days, to reduce waste. You can also cut your costs by taking advantage of special promotions and by shopping at market stalls, which are often cheaper than supermarkets. If you live alone you could save money by splitting purchases with friends (buying bulk is usually cheaper) or by cooking several portions of a dish and freezing some of them. This also saves energy and saves you the effort of preparing meals every day.
Frozen fruit and vegetables are often cheaper than fresh produce and are usually just as good nutritionally (with no wastage). Fresh fruit and vegetables are usually cheapest when they are in season. Beans, lentils and soy mince are also cheaper than meat and just as nutritious.
Eat regular meals throughout the day to maintain blood sugar levels.
Make sure you eat at least three meals each day. Missing meals, especially breakfast, leads to low blood sugar and this causes low mood, irritability and fatigue. If you feel hungry between meals you may need to include a healthy snack eg. fruit, nuts and cereals.
East fewer high sugar foods and more wholegrain cereals, nuts, beans, lentils, fruit and vegetables.
Sugary foods are absorbed quickly into the bloodstream. This may cause an initial ‘high’ or surge of energy that soon wears off as the body increases its insulin production, leaving you feeling tired and low.
Wholegrain cereals, pulses, fruit and vegetables are more filling and, because the sugar in these foods is absorbed more slowly, don’t cause mood swings.
These foods are more nutritious as they contain thiamin (B1), a vitamin that has been associated with control of mood, and folate and zinc (supplements of these nutrients have been shown to improve the mood of people with depression in a small number of studies).
Aim to eat at least five portions of fruit and vegetables a day eg. 1 glass of orange juice or ½ grapefruit for breakfast, a banana or apple for a mid morning snack, salad at lunch time and then two types of vegetable (a portion is roughly two serving spoons) and piece of fresh or baked fruit for your evening meal.
NB: Green vegetables should be steamed or boiled in a little water and should not be overcooked or you will lose much of the vitamin content.
Avoid sugar and sugary drinks, cakes, sweets and puddings. These are loaded with calories but have little nutritional value and may trigger mood swings because of their sugar content.
Protein in your diet:
Include protein at every meal to ensure a continuous supply of the amino acid tryptophan to the brain.
We all need to eat enough protein to maintain our skin, organ, muscle and immune function but recent research suggests that one particular component of protein, the amino acid tryptophan, can influence mood.
Supplements of tryptophan were tested in studies and in some were shown to improve the mood of people with depression. The supplements were not considered safe and were removed from the market. However, you can ensure your brain gets a regular supply of tryptophan by including at least one good sized portion of protein at each meal ie. meat, fish, eggs, milk, cheese, nuts, beans, lentils (dhal), or a meat substitute such as textured vegetable protein or mycoprotein.
NB: Peanuts are low in tryptophan so if you eat them at a meal-time include another source of protein (eg. other nuts) at the same time.
Variety of food:
Eat a wide variety of foods to keep your diet interesting and to ensure you obtain all the micronutrients you need.
The more varied your diet, the more likely you are to obtain all the nutrients you need. If you have bread at one meal, try cereal or potatoes, rice or sweet potatoes at the others. Make sure you include at least 2 portions of different fruits and/or vegetables and a protein food at each meal.
Include some red meat and fish, as they are good sources of vitamin B12, another nutrient that seems to be associated with mood. If you are vegetarian or have a limited budget, include fortified soy mince and yeast extract to increase your intake of this vitamin.
Fish in your diet:
Include fish, especially oily fish, in your diet.
A few studies suggest that omega 3 oil supplements may reduce symptoms in people with depression on antidepressant medications. These studies are small but we know that a proper balance of omega 3 and omega 6 oils in the diet is important.
To get a good balance of mega 3 and 6 oils:
If you don’t like fish you could try an omega 3 supplement (choose one that is purified, contains no vitamin A and has a high eicosapenanoic acid (EPA) content – take no more than 1g EPA per day). If you are vegetarian, try a flax seed supplement (although only a very small fraction of the omega 3 contained in plant products can be used by the body).
Maintain a healthy weight.
Depression affects different people in different ways. Some people lose interest in food or can’t motivate themselves to shop and cook, so lose weight. Others find they want to eat more and gain weight when they are unhappy. Some medications can also increase or decrease your appetite – if you are concerned that the medication you are taking has made your weight problems worse, speak to your doctor.
Both excessive weight loss or weight gain can make your mood worse and should be avoided. Weight loss and lack of good nutrition will deprive the brain of glucose and the other nutrients that control mood – you may need the advice of a dietitian to help you overcome this problem.
Putting on weight unintentionally or feeling out of control of your eating can increase your depression and can lead to yo-yo dieting, which leaves you further out of control. If you are overweight, follow the advice on healthy eating but be extra careful to limit your fat and sugar intake (no fries, pies, cakes, puddings, sweets, chocolate or sweet drinks), use less fat in cooking, reduce your alcohol consumption, avoid sugary drinks, and increase your exercise levels.
Maintain adequate fluid intake.
Not drinking enough fluid has significant implications for mental health. The early effects of even mild dehydration can affect our feelings and behaviour.
An adult loses approximately 2.5 litres of water daily through the lungs as water vapour, through the skin as perspiration and through the kidneys as urine. If you don’t drink enough fluids to replace this loss then you will get symptoms of dehydration, including irritability, loss of concentration and reduced mental functioning.
Coffee, colas, some energy drinks and tea all contain caffeine, which some people use to boost energy levels. However, in large quantities caffeine can increase blood pressure, anxiety, depressive symptoms and sleep problems.
Caffeine also has a diuretic effect in the body – it encourages the production of urine and therefore leads to dehydration. For this reason you should not rely solely on caffeine-based fluids.
If you do take drinks with caffeine in them, try to limit yourself to just 3–4 cups per day and drink other fluids such as water, fruit juice and non-stimulant herbal teas at other times. Chocolate also contains caffeine and should be limited to an occasional treat.
Limit your alcohol intake.
Alcohol has a depressant effect on the brain and can result in a rapid worsening of your mood. It is also a toxin that has to be deactivated by the liver. During this detoxification process the body uses thiamin, zinc and other nutrients and this can deplete your reserves, especially if your diet is poor.
Thiamin and other vitamin deficiencies are common in heavy drinkers and can cause low mood, irritability and/or aggressive behaviour, as well as more serious and long-term mental health problems.
Because the body uses important nutrients to process alcohol, people who experience depression should consider avoiding alcohol until they have recovered. Even then, because of alcohol’s depressant effects, they should consider drinking only small amounts – no more than once a week.
If you do want to drink alcohol, try not to exceed the recommended safe limits – two units a day for women and three units for men.
1 unit = 1 small glass wine (8 % ABV)
Exercise leads to the release of endorphins – feel-good chemicals in the brain that help us to relax and to feel happy. Exercise is particularly important for people with depression as it also gives structure and purpose to the day. Outdoor exercise that exposes us to sunlight is especially valuable as it affects the pineal gland and directly boosts mood.
Exercise has some other advantages if you are trying to control your weight. For example, the more you exercise, the less you need to cut down on your calorie intake to control your weight. It is also beneficial for heart health and it ensures that you replace fat with muscle, resulting in a more toned body. Exercise also prevents bone mass loss and the increased risk of osteoporosis that can occur if you diet but don’t exercise.
There is no need to join a gym – walking is the easiest, cheapest and best form of exercise and it can be built up as your fitness level increases. Swimming is good for people with joint problems who find weight-bearing exercise difficult. Cycling is also good. Whatever kind of exercise you choose, start with 20 minutes at least three times a week and increase this as your fitness improves.
At the moment evidence for the benefits of nutritional supplements is weak, but if you decide to try them:
It is important to remember that supplements are not an alternative to a healthy diet and you should still maintain a varied and balanced diet.
Sample meal pattern:
Breakfast 1/2 grapefruit / fruit juice
Cereal e.g. wholegrain or bran cereal / porridge, with semi-skimmed milk
1–2 slices wholemeal bread / toast with scraping of monounsaturated spread / butter, and kippers / egg / grilled bacon / baked beans
Tea / coffee / herbal tea / water
Mid morning Tea / coffee / herbal tea / water
Fruit / nuts
Or jacket potato with baked beans / tuna and corn / chilli con carne / prawn filling, and salad
Or soup e.g. pea and ham / farmhouse broth, and bread
Or salad with meat / fish / egg / cheese, and bread
Or cooked meal – see below
Fruit / yoghurt
Tea / coffee / herbal tea / water
Fruit / fruit and nuts / mixed seeds
Fresh / tinned fruit / baked fruit and low fat crème fraiche / yoghurt
Tea / coffee / herbal tea / water
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