Vegetables that are high in carbohydrates are generally not allowed or should be limited on a keto diet. These include starchy vegetables like potatoes, sweet potatoes, corn, and peas. Root vegetables such as carrots and beets are also higher in sugars and should be consumed in moderation. The key to a keto-friendly diet is to focus on low-carb vegetables like leafy greens, cauliflower, broccoli, zucchini, and bell peppers, which provide essential nutrients without significantly increasing your carb intake.