Too much fat in your diet, especially saturated fats, can raise your cholesterol, which increases the risk of heart disease.
Current UK government guidelines advise cutting down on all fats and replacing saturated fat with some unsaturated fat.
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A small amount of fat is an essential part of a healthy, balanced diet. Fat is a source of essential fatty acids, which the body can't make itself.
Any fat not used by your body's cells or to create energy is converted into body fat. Likewise, unused carbohydrate and protein are also converted into body fat.
All types of fat are high in energy. A gram of fat, whether saturated or unsaturated, provides 9kcal (37kJ) of energy compared with 4kcal (17kJ) for carbohydrate and protein.
The main types of fat found in food are:
Most fats and oils contain both saturated and unsaturated fats in different proportions.
As part of a healthy diet, we should try to cut down on foods and drinks high in saturated fats and trans fats, and replace some of them with unsaturated fats.
Saturated fats are found in many foods, both sweet and savoury. Most of them come from animal sources, including meat and dairy products, as well as some plant foods, like palm oil and coconut oil.
Cholesterol is mostly made by the body in the liver.
It's carried in the blood as:
Too much saturated fats in your diet can raise LDL cholesterol in the blood, which can increase the risk of heart disease and stroke.
HDL cholesterol has a positive effect by taking cholesterol from parts of the body where there's too much of it to the liver, where it's disposed of.
Most people in the UK eat too much saturated fats.
The government recommends that:
Trans fats are found naturally at low levels in some foods, such as meat and dairy products.
Trans fats can also be found in hydrogenated vegetable oil. Hydrogenated vegetable oil must be declared on a food's ingredients list if present.
Like saturated fats, trans fats can raise cholesterol levels in the blood.
The government recommends that:
But most people in the UK don't eat a lot of trans fats. On average, we eat about half the recommended maximum.
Most of the supermarkets in the UK have removed hydrogenated vegetable oil from all their own-brand products.
We eat a lot more saturated fats than trans fats. This means that when looking at the amount of fat in your diet, it's more important to focus on reducing the amount of saturated fats.
If you want to cut your risk of heart disease, it's best to reduce your overall fat intake and swap saturated fats for unsaturated fats.
There's good evidence that replacing saturated fats with some unsaturated fats can help lower cholesterol.
Found primarily in oils from plants and fish, unsaturated fats can be either polyunsaturated or monounsaturated.
Monounsaturated fats help protect our hearts by maintaining levels of good HDL cholesterol while reducing levels of bad LDL cholesterol.
Monounsaturated fats are found in:
Polyunsaturated fats can help lower the level of LDL cholesterol.
There are two main types of polyunsaturated fats: omega-3 and omega-6.
Some types of omega-3 and omega-6 fats can't be made by the body and are therefore essential in small amounts in the diet.
Omega-6 fats are found in vegetable oils, such as:
Omega-3 fats are found in oily fish, such as:
Most of us get enough omega-6 in our diet, but we're advised to have more omega-3 by eating at least two portions of fish a week, including one of oily fish.
Vegetable sources of omega-3 fats aren't thought to have the same benefits on heart health as those found in fish.
The nutrition labels on food packaging can help you cut down on total fat and saturated fat (also listed as "saturates", or "sat fat").
Nutrition information can be presented in different ways on the front and back of packs.
For a product to be labelled lower fat, reduced fat, lite or light, it has to contain at least 30% less fat than a similar product.
But if the type of food in question is high in fat in the first place, the lower fat version may also still be high in fat (17.5g or more of fat per 100g).
For example, a lower fat mayonnaise is 30% lower in fat than the standard version, but is still high in fat.
These foods also aren't necessarily low in calories. Sometimes the fat is replaced with sugar and may end up with a similar energy content.
To be sure of the fat content and the energy content, remember to check the nutrition label on the packet.
Cutting down on fat is only one aspect of achieving a healthy diet. Find out more about how to get a balanced nutritious diet in the Eatwell Guide.
Use the Be Food Smart app to compare products and get ideas on how to make healthy choices.
Important: Our website provides useful information but is not a substitute for medical advice. You should always seek the advice of your doctor when making decisions about your health.