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Trans fats should be limited for optimal health because they have been shown to increase levels of bad cholesterol (LDL) while decreasing levels of good cholesterol (HDL). This unfavorable effect on cholesterol levels significantly raises the risk of heart disease, stroke, and type 2 diabetes. Trans fats are often found in partially hydrogenated oils, which are commonly used in processed foods, baked goods, and fried items to improve shelf life and texture.

In contrast, monounsaturated fats and polyunsaturated fats, which are found in foods like olive oil, avocados, nuts, and fatty fish, are beneficial for heart health. They can help lower LDL cholesterol and are essential for overall body function. Saturated fats, while needing to be consumed in moderation, are not as harmful as trans fats and can be part of a balanced diet when chosen wisely.

For optimal health, it is essential to minimize the intake of trans fats due to their adverse effects on cardiovascular health while including healthier fat sources in the diet.