Brutal Salty Energy — Fat First, not dogmatic
The BSE Guide — Eat right, perform better.
Fat First is not a religion. It's a starting point. Depending on your effort, your level of adaptation, and your goal—the right fuel changes. This guide helps you choose.
One fuel per type of training
Long aerobic effort · 50-70% max HR · Fat adaptation. Less than 4g of carbohydrates per hour is sufficient when you are adapted.
Training vs Race
Because it's not the same fuel.
In training, the goal is to adapt your metabolism—learn to burn fat, push back the switch to carbohydrates. The less you give your body, the more it learns to do without.
In a race, the goal is to perform now. Carbohydrates become a tactical tool—not a permanent crutch. BSE ULTRA and FLUID ULTRA SHOT are designed for this precise moment.
Fat First — but not dogmatic.
BSE was born from an observation at UTMB—all the brands were selling sugar. We chose a different path. But Fat First isn't an ideology—it's a tool.
If you're running a high-intensity 100-miler, you need carbohydrates. If you're doing 3 hours of Zone 2 on a Sunday morning, you don't. BSE offers both—with the science to help you choose.
BSE practical guides
Ready to switch fuels?
Start with FUEL ZONE 2 — the product that started it all. Macadamia Salt. Less than 4g of carbohydrates. Made in Europe.