No longer the purview of Gwyneth Paltrow fans and Instagram influencers, the keto diet may finally be infiltrating the military.

A director from U.S. Special Operations Command has promoted the idea of service members following the ketogenic diet, which is high in fat and low in carbs. The diet recommends meat, fish, high-fat dairy, eggs, nuts, and leafy green vegetables, but prohibits starches, grains, and sugars (possibly including fruit, depending on how strict you get). The diet aims, over time, to adapt the body to burning fat for energy, a process called ketosis, instead of carbohydrates.