Are butter and bacon really the bad guys? With new research showing saturated fat might not be as damaging to health as originally thought, nutritionist Jo Lewin explains what these findings mean for your daily diet...
What we thought we knew about saturated fat...
For decades, the health community has presented saturated fat as a major risk factor for the development of cholesterol and heart disease. The demonisation of saturated fat was based on the theory that it raised LDL (bad) cholesterol, which is thought can block arteries and increase the risk of heart attack and stroke.
Now, new evidence suggests that saturated fat may not be directly linked to raised LDL cholesterol, however eating a diet high in fat can contribute to obesity, which in itself is a risk factor for heart disease.
It is important to monitor your total fat intake and eat a healthy, balanced diet. The Department of Health recommends that total fat intake should not exceed 35% of our total daily energy (calorie) needs.
Saturated fat - what still holds true?
- Saturated fat is the kind of fat found in butter and lard, pies, cakes and biscuits, fatty cuts of meat, sausages and bacon, and full fat dairy products such as cheese and cream.
- Most of us eat too much saturated fat - about 20% more than recommended maximum amounts.
- The recommended daily amounts of total (and saturated) fat remain the same:
Men: no more than 95g fat (30g of saturated fat) a day.
Women: should eat no more than 70g fat (20g of saturated fat) a day.
New research - out with the old...
Recent research suggests the longstanding advice to cut out saturated fats and increase polyunsaturated fats (such as omega-3 and omega-6) may not be crucial to health after all. The study, published in the Annals of Internal Medicine, analysed data from over 600,000 participants and concluded that;
''Current evidence does not clearly support (existing) cardiovascular guidelines that encourage high consumption of polyunsaturated fatty acids and low consumption of total saturated fat''.
Other research looking at the relationship between saturated fat intake and the incidence of heart disease, has also found the results to be inconclusive.
New research does not support existing guidelines to limit the consumption of saturated fat in order to reduce the risk of heart disease. The only types of fat found to have a significant link to coronary disease were trans-fats.
A bit about trans-fats...
Trans fatty acids (or trans-fats) are produced when vegetable oils are hydrogenated. This is a chemical process that hardens the vegetable oil for their widespread use as an ingredient in frying and baking. Hydrogenated oils are used by food manufactures to improve the shelf life, taste and culinary properties of processed foods such as biscuits, cakes, pies and takeaway foods. There is a small amount of naturally occurring trans-fats in dairy products, such as cheese and cream and in beef, lamb and mutton.
Concern about the health implications of consuming high intakes of trans-fats has led to changes in manufacturing practices in recent years and good progress has been made to remove them from some foods, although there has not been a complete ban.
Why avoid trans-fats?
Trans-fats have been proven to raise blood cholesterol levels, particularly levels of ‘bad’ LDL cholesterol. Trans-fats can also reduce the ‘good’ HDL cholesterol, as well as increasing levels of triglycerides - another form of blood fat. All of these effects of trans-fats can raise your risk of coronary heart disease (CHD) and dietary intake should be controlled.
Is saturated fat good or bad?
When asking whether saturated fat is good or bad, the question should be, compared to what?
- Compared to trans-fats, saturated fat is healthier.
- Compared to complex carbohydrates, such as wholegrains, saturated fat is neutral.
- Compared to refined carbohydrates found in white breads, sweet breakfast cereals and snack foods, saturated fat appears to be a better choice...
...Refined carbohydrates are more likely than saturated fat to contribute to heart disease and other health issues. Simple changes, such as swapping white bread for wholegrain and increasing your intake of fruits and vegetables would have a bigger impact on heart disease risk than simply reducing saturated fat.
How to read food labels...
When looking at food labels, look at the per 100g column to judge if they contain high levels of fat:
High = 20g fat per 100g
Medium = 3.1g-20g fat per 100g
Low = 3.1g fat per 100g
A balanced diet is key...
Recommendations for a healthy diet are to get enough exercise, eat whole foods where possible, stick to sensible portion sizes and vary the foods you eat. The Mediterranean diet, based upon fruits, vegetables, whole grains, fish and products made from vegetable and plant oils, has been linked to a lower risk of heart attack and cardiovascular related issues. Eating a diet rich in whole foods, paying attention to what is consumed as well as what is excluded, is often more effective in preventing against cardiovascular disease than restrictive, low-fat and low-cholesterol diets.
How do you feel about the lastest evidence regarding saturated fat? We'd love to hear what you think...