4. Margarine (with Trans Fats)
Not all margarines are created equal. Stick margarines often contain artificial trans fats, which are especially harmful for heart health. These fats can drive up bad cholesterol and lower good cholesterol, greatly increasing cardiovascular risk. Although the FDA has banned most trans fats in foods, some processed spreads and baked goods still contain them in small amounts. Cardiologists read labels carefully and steer clear of margarine brands with partially hydrogenated oils.