Nuts are a slippery slope. They provide healthy fats but some nuts are higher in carbs than you might realize. (Peanuts, cashews and pistachios are especially high compared to walnuts, macadamias, pecans, and Brazil nuts, for example.) The biggest problem with nuts — and especially nut butters — is that they’re delicious and they’re very common binge or trigger foods. Many people can’t control the amount of these they eat and they find it’s easier to avoid them completely than it is to try to have only a small handful or one spoonful. Even for nuts that are ultra-low in carbs, they’re very high in calories, and calories do matter on a keto diet. If you can limit your portions, then nuts are okay.