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Finally, we need to mention a special group of fatty acids called ‘trans fats’. You may notice on some low-fat spreads a label stating that ‘This product contains virtually no trans fats’. These products are good ones to choose because high intakes of trans fats have been linked with heart disease.

Trans fats are found in polyunsaturated fats that have been artificially processed in some way. For example, reheating vegetable oil changes the (healthy) fatty acids in that oil to (unhealthy) trans fats. A similar thing happens when liquid fats are hardened to use in factory-produced pastry and hard margarine. Butter, cream and cream cheese also contain some trans fats. The words ‘hydrogenated vegetable oil (or fat)’ on food labels means that the food probably contains trans fats.

We talk more about avoiding the unhealthy types of fats in Chapter 8.