Foods that should be avoided for optimal health include processed foods, excessive sugars, and trans fats. These types of foods can increase the risk of chronic diseases, lead to weight gain, and adversely affect metabolism. Highly processed items often contain artificial additives and lack essential nutrients, negatively impacting overall health. Additionally, excessive consumption of sugary beverages and snacks can contribute to insulin resistance and inflammation. Choosing whole, nutrient-rich foods supports better health outcomes and sustains long-term well-being.