The key to a healthy diet is to:
Eat the right amount of calories for how active you are, so that you balance the energy you consume with the energy you use. If you eat or drink too much, you'll put on weight. If you eat and drink too little, you'll lose weight.
Eat a wide range of foods to ensure that you're getting a balanced diet and that your body is receiving all the nutrients it needs.
It is recommended that men have around 2,500 calories a day (10,500 kilojoules). Women should have around 2,000 calories a day (8,400 kilojoules). Most adults are eating more calories than they need, and should eat fewer calories.
Base your meals on starchy carbohydrates
Starchy carbohydrates should make up just over one third of the food you eat. They include potatoes, bread, rice, pasta and cereals.
Choose wholegrain varieties (or eat potatoes with their skins on) when you can: they contain more fibre, and can help you feel full for longer.
Most of us should eat more starchy foods: try to include at least one starchy food with each main meal. Some people think starchy foods are fattening, but gram for gram the carbohydrate they contain provides fewer than half the calories of fat.
Keep an eye on the fats you add when you're cooking or serving these types of foods because that's what increases the calorie content, for example oil on chips, butter on bread and creamy sauces on pasta.
Eat lots of fruit and veg
It's recommended that we eat at least five portions of a variety of fruit and veg every day. It's easier than it sounds.
Why not chop a banana over your breakfast cereal, or swap your usual mid-morning snack for a piece of fresh fruit?
Unsweetened 100% fruit juice, vegetable juice and smoothies can only ever count as a maximum of one portion of your 5 A DAY. For example, if you have two glasses of fruit juice and a smoothie in one day, that still only counts as one portion.