One of the most important things to include in a balanced food plan is healthy fats. Delicious, nutritious, and satiating healthy fats also boast benefits like heart-healthy omegas. While there are plenty of options out there, pistachios are one of the most effective when it comes to finding — and keeping — your happy weight. Here’s why: Yet compared to practically every other nut out there, pistachios yield far fewer calories per serving. If we’re talking sheer quantity, you’d have to eat twice the number of pistachios to get the same amount of calories as a handful of almonds, walnuts, cashews or anything else. Plus a study in from France shows that adding 250 extra calories from pistachios to your diet leads to zero change in body weight. It might seem innocuous, but that small barrier of having to peel a pistachio out of its shell is scientifically proven to reduce consumption. The process of deshelling causes you to eat more slowly, appreciate every bite, and introduce other senses (like touch) into the experience.