Trans fats are found in any food that comes into contact with cooking oil, but also in some industrial and processed foods (pastries, sandwiches, cereals, cakes ...). Some natural foods are high in trans fat but just contain a few compared to industrial foods.
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Trans fats are widely used by industry and are found in many dishes and other industrial pastries. Trans fats may be natural but they are often obtained artificially by the process of hydrogenation.
The body does not need trans fats and they even can lead to an increased cardiovascular risk if they are consumed regularly.