There’s no evidence that eating a balance of colours leads to a balance in nutritional content, although the natural compounds (phytochemicals) that give fruit and vegetables their colour may be beneficial.
Many of these phytochemicals are antioxidants (natural chemicals that are thought to protect against harmful substances called free radicals), and diets rich in foods that contain these, like fruits and vegetables, are associated with lower levels of cardiovascular disease (CVD).
Eating a variety of foods will help you get essential nutrients and, by doing so, you’ll naturally embrace a broad colour palette. Fruits and vegetables are particularly colourful, so a rainbow plate can help you towards your 5-a-day. Plus, you’re more likely to enjoy eating an attractive meal.
Properties: Contain antioxidants including lycopene (in tomatoes), anthocyanins (red berries, including strawberries), ellagic acid (strawberries, raspberries and pomegranate) and astaxanthin (crab, salmon and prawns).
Health benefits: Lycopene gives red fruits their colour. It is thought to have antioxidant properties that may help protect against CVD and has been reported to help reduce blood pressure and cholesterol.
Lycopene is more easily absorbed in the body when it’s cooked (such as in a homemade tomato sauce). While there is some research to support lycopene’s health benefits, much of it is low quality, so more research is needed. Don’t let that stop you including red fruits and veg in your diet.
As well as the usual vitamins, minerals and fibre that come with all fruits and vegetables, the pop of colour will add interest to everyday dishes. Add pomegranate seeds or cherry tomatoes to a green salad or cous cous or strawberries to a bowl of porridge.
Suggestions: Cherries, cranberries, radishes, red apples, red grapes, red peppers, tomatoes, watermelon.
Top tip: Add chopped tomatoes to omelettes or burritos.
- Get our recipe for jewelled couscous salad.
- Get our recipe for beef and bean burritos.
Properties: High in carotenoids, such as alpha-carotene and beta-carotene.
Health benefits: Beta-carotene gives yellow and orange fruits and vegetables their colour and is converted to vitamin A in the body, where it helps us make hormones and keeps our eyes healthy.
Carrots, butternut squash, pumpkin and sweet potato are all good sources of this vitamin – hence the saying that carrots will help you to see in the dark. In the past, population studies suggested vitamin A (along with vitamins C and E) could help prevent heart attacks.
However, large trials of vitamin A supplementation either alone or in combination with other vitamins haven’t confirmed this. The relationship observed in the original studies may have been a coincidence, or the benefits of consuming nutrients in food may not always be replicated by supplements.
Taking individual supplements should be avoided, unless recommended by your doctor, as it’s easy to consume too much. There is no evidence that eating beta-carotene from foods is harmful, however, so it’s fine to have plenty of orange fruits and vegetables. Citrus fruits like oranges are low in vitamin A but high in vitamin C. Dried apricots are a great source of fibre, iron, potassium and calcium too (but stick to a 30g portion as dried fruits are high in energy).
Suggestions: Cantaloupe melon, mangoes, nectarines, orange peppers, pumpkin, sweet potatoes.
Top tip: Add dried apricot or mango to porridge or cereal.
- Get our recipe for sweet potato curry with spinach and chick peas.
Properties: Contain carotenoids including beta-carotene and beta-cryptoxanthin.
Health benefits: As with orange fruit and vegetables, beta-carotene gives yellow varieties their colour. Foods like sweetcorn, peach, papaya and egg yolk are also rich in the antioxidant beta-cryptoxanthin.
Like beta-carotene, our bodies can convert beta-cryptoxanthin into vitamin A. While some studies have suggested health benefits, such as reducing the risk of rheumatoid arthritis and certain cancers, the evidence is not strong enough for us to recommend specific fruits or vegetables. However, including yellow fruits and vegetables in your diet helps you towards your 5-a-day.
Suggestions: Butternut squash, honeydew melon, lemons, papaya, peaches, persimmons, swede, yellow peppers.
Top tip: Add yellow peppers to chilli, bolognese and salads, or swede to casseroles.
- Get our recipe for barbecued courgettes and peppers with lemon and mint.
Properties: The pigment chlorophyll gives green fruits and vegetables their colour, but many green vegetables are rich in other nutrients too. Broccoli, cabbage, Brussels sprouts, kale and pak choi are all sources of sulforaphane and glucosinolate.
These vegetables also contain lutein and zeaxanthin, as do peas, sweetcorn, yellow peppers and eggs.
Health benefits: Studies suggest that sulforaphane may help protect against blood-vessel damage and certain cancers. However, most of these studies are based on mice, or human cells in the lab, rather than people.
Further research is needed in humans, including into whether eating broccoli will have the same effect as taking sulforaphane supplements.
We’re currently funding several studies to find out whether sulforaphane could help protect against the damage caused by heart attacks, stroke and gestational diabetes.
There is evidence to suggest lutein and zeaxanthin-rich vegetables, like kale, spinach, broccoli and peas, may help prevent and slow the progression of an eye disease, age-related macular degeneration.
Rather than focusing on a particular fruit or vegetable, aim to increase the total amount of both in your diet, and don’t forget leafy green vegetables.
Suggestions: Apples, asparagus, avocados, celery, courgettes, cucumbers, green grapes, leeks, lettuce, limes, mange tout, sugar snap peas.
Top tip: Stir peas into cooked rice to add colour and nutrients.