Yes. A fruit is a carb and a ketogenic diet stipulates that the main part of your diet should be high quality fats. Obtaining enough of these fats to enter into nutritional ketosis has typically been more difficult for people who have followed standard “low fat, complex carbohydrate” diets. Even when they do follow low fat guidelines, too many high glycemic index carbs in their diet prevents them from entering into nutritional ketosis because it raises blood sugar levels beyond what can be called healthy even by most keto standards (and remember that the body only produces enough insulin to maintain an average blood sugar level in nondiabetics – all diabetic medications suppress insulin completely in order to avoid dangerous swings in blood sugar levels).