The keto diet, without a doubt, is a very effective way to lose weight. This is a low-carb, high-fat diet. What happens when you drastically reduce your carb intake? Your body will be brought into a metabolic state and will be able to convert fat into energy. You may not know, but nuts are very good for the keto diet, even though they are calorie dense. They are healthy and low in net carbs and high in healthy fats.