You can do this by replacing high-fat foods with those that are low in fat such as fruit, vegetables, unrefined carbohydrates and lower-fat dairy products, and by being more physically active.
It's also important to watch the size of your portions. This can be difficult, because over time you can lose touch with what's a sensible amount of food.
Meat, fish, eggs and alternatives, such as beans and lentils, provide protein, which is essential for growth and repair. These protein-rich foods, meat in particular, are also good sources of iron, selenium, zinc and B vitamins.
Lean sources of protein can also help to curb your appetite. To help reduce the calories you get from fat, remove the skin from chicken, cut off obvious bits of fat from lamb, pork and beef, and use minimum oil for cooking.
Aim to eat two portions of fish a week, one of which should be oily fish rich in omega-3 fatty acids, such as salmon, sardines or trout.
You should have two portions of protein-rich foods every day. A portion is equivalent to:
- Meat and fish the size of a pack of playing cards
- Two eggs
- Four tablespoons of lentils or beans
Starchy foods should make up about a third of your total daily energy intake.
Choose unrefined types that are higher in fibre. They'll make you feel full for longer and help to control hunger.
A balanced diet should contain about five portions of starchy foods each day. A portion is equivalent to:
- Three tablespoons of breakfast cereal
- One large slice of bread
- One chapatti
- Three heaped tablespoons of pasta
- Two egg-size potatoes
- Two heaped tablespoons of rice
Everyone should aim to increase the amount of fruit and vegetables in their diet.
Because fruit and vegetables are bulky and contain a lot of water, they can help to control your calorie intake. Aim for at least five portions a day.
A portion weighs about 80g and can include fresh, canned, frozen and dried fruit and vegetables. A portion is equivalent to:
- Two large tablespoons of vegetables, such as peas, carrots, swede or broccoli
- Whole fruits, such as one apple, one orange, one pear
- A handful of grapes
- Two tablespoons of strawberries or raspberries
- One small glass of fruit juice
- A handful of dried fruit
Aim for around three portions of dairy foods a day. A portion is equivalent to:
- A medium-size glass of milk
- A small pot of yoghurt
- A small matchbox-sized piece of cheese