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It's also important to eat plenty of fruit and veg, including salads, because this can help prevent heart disease and some types of cancer, as well as being good for general health. We should all be trying to eat at least five portions of a variety of fruit and veg every day. A dessert bowl of salad is one portion and if you have a big mixed salad with lots of veg, this could count as more than one.
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On this page
Tomatoes
Lettuce
Cucumber
Avocados
Other ideas
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Tomatoes
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Nutrition
Tomatoes are rich in vitamin C and they contain vitamins A and B, potassium, iron and phosphorus. They also contain a substance called lycopene, which is the pigment that makes tomatoes red. Research suggests that lycopene may help to protect against some diseases, including cardiovascular disease and some types of cancer, such as prostate cancer.
Serving suggestion
Mango, tomato and red onion with a spicy dressing.
Lettuce
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Today, there are literally hundreds of different varieties of lettuce grown throughout the world. Summer is the perfect time to tuck into British-grown varieties such as cos, Webb's, iceberg and little gem.
Or try loose-leafed lettuces such as lollo rosso or oak leaf. These have a fuller flavour and deeper colour than round lettuces.
Nutrition
All types of lettuce are low in calories and most of them contain vitamins and minerals including calcium, iron, potassium, vitamin C, folate and antioxidant nutrients called carotenoids. The darker varieties tend to contain the most nutrients.
Serving suggestion
Rocket, pear slices and pecan nuts.
Cucumber
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Nutrition
Like many other salad vegetables, cucumber is very low in calories. It's mainly made up of water, which means it's refreshing to eat in hot weather. It also contains small amounts of calcium, phosphorous and potassium.
Serving suggestion
A classic Greek salad with chunks of cucumber, tomato, feta cheese and black olives.
Avocados
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Nutrition
Avocados contain lots of vitamins and minerals, including vitamin E, potassium and vitamin B6. They are also high in monounsaturated fatty acids, which can help to lower cholesterol levels in the blood. So, avocados are a healthy choice, but because they contain more fat than most fruit and veg, try not to eat them too often. Half an avocado counts as one portion of fruit and veg.
Serving suggestion
Slices of avocado and tomato, prawns and lettuce leaves.
Other ideas
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You can also make some great dressings at home. To start with, try a vinaigrette. Mix some red wine vinegar, mustard and chopped shallots in a small bowl, then add some olive oil. To spice up a basic dressing, try adding ground cumin, caraway seeds or paprika.
Fresh herbs such as parsley, thyme, tarragon, chives, chervil and basil can add terrific flavour to dressings.
Go easy with the mayonnaise and ready-made salads that are coated in mayo (such as coleslaw), because these are high in fat. Try using low-fat plain yoghurt instead.