Why do athletes bonk?

Gabriella Smith ran a 2:58 marathon six months postpartum and ended up in the ER. Four weeks into Fuelin, the marathoner and mother of two shares what chronic under-fueling actually looked like, why "eating clean" was a trap, and what changes when you stop guessing.

Wearing two devices at once sounds like overkill. Yet is the data commparable?

Before we talk about nutrition, metabolism, or consistency, let’s start with what athletes actually pay attention to: results.

Want to learn what it takes to crush The Western States 100 Mile Run?

Here’s the truth: athletes obsess over gels and bottles on the bike and run while ignoring the most significant contributor to performance and body composition—your everyday nutrition.

Every athlete has a purpose. Some are motivated to live a healthy, active lifestyle. Others are driven to win. No matter the motivation, success requires nutrition that works for your goals. This is why Fuelin was created: to offer personalized nutrition that empowers individuals to achieve their unique goals.