For better health, saturated fats and trans fats should be limited in one's diet. Saturated fats, found in red meat and full-fat dairy, can raise LDL cholesterol levels, increasing the risk of heart disease. Trans fats, often found in processed foods and margarine, are particularly harmful, as they not only elevate bad cholesterol (LDL) but also lower good cholesterol (HDL). Instead, focus on incorporating healthy fats, such as those from olive oil, avocados, and nuts into the diet, which can improve lipid profiles and overall heart health.