02/02/2026
Most people think weight loss is about eating less and moving more. So they cut calories. They train harder. And maybe the scale moves for a few weeks. Then it stops. And nothing they do makes a difference.
Here’s what’s actually happening: your metabolism isn’t switching between fuel sources efficiently. A healthy metabolism burns fat when you’re fasting and sugar when you’re eating. But when metabolic flexibility breaks down, your body gets stuck using one fuel source—usually sugar—and stops accessing stored fat for energy. The scale won’t move because your body literally can’t burn fat the way it should.
This isn’t about willpower or finding the right diet. It’s about cellular function.
This is what we see clinically: someone’s been restricting calories and exercising consistently for months. Nothing changes. We run metabolic testing and find their fat-burning pathways are dormant, their mitochondria aren’t producing energy efficiently, and their body defaults to sugar no matter what they eat. No diet was going to fix that—because the issue isn’t effort. It’s how their cells use fuel.
At Mancuso Clinic, we test metabolic flexibility with . Then we know exactly what needs to change.
👇 DM ‘METABOLIC’ to book metabolic testing and find out how efficiently your body burns fuel.