Yes, on a keto diet, you should avoid or limit high-carb foods, such as grains (wheat, rice, corn), starchy vegetables (potatoes, sweet potatoes), sugary foods (sweets, sugary beverages), and most fruits (as they are higher in sugars). Instead, focus on consuming foods rich in healthy fats (avocado, nuts, olive oil), moderate protein (meat, fish, poultry), and low-carb vegetables (leafy greens, broccoli, cauliflower).